Late Summer Shanghai

As summer melts into fall, Pudong’s Cape Nanhui continues to prove to be one of the best birding locations in China. In the period 26 Aug. to 8 Sept. 2017, I birded four days at the most southeasterly point of Shanghai, as well as at other key locations in Earth’s Greatest City. I noted 106 species.

Highlights were Brown-chested Jungle Flycatcher at Microforest 1, beautiful white-morph Amur Paradise Flycatcher at Binhai Forest Park, Fairy Pitta in the Cape Nanhui microforests, Greater Painted-snipe holding on in a canal near the coast, Asian Dowitcher at South Pond, Chinese Egret at North Pond and on South Beach, and Pacific Golden Plover at the sod farm south of Pudong Airport. Sakhalin Leaf Warbler and Pale-legged Leaf Warbler were calling in the Magic Parking Lot, and endangered Far Eastern Curlew and Great Knot were recorded at Nanhui. Crested Goshawk appeared in inner-city Zhongshan Park.

Here are some of the best birds:

Brown-chested Jungle Flycatcher
Cyornis brunneatus

Brown-chested Jungle Flycatcher, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
Brown-chested Jungle Flycatcher, Microforest 1 (30.923889, 121.971635), 4 Sept. 2017. Cyornis brunneatus is a very scarce vagrant to Shanghai. The species breeds in southeast China and spends the winter in Malaysia and Indonesia. (Craig Brelsford)

After nearly 10 years in Shanghai and countless visits to Cape Nanhui, I still occasionally score life birds there, a testament to the richness of the hot spot. Such was the case 4 Sept. with Brown-chested Jungle Flycatcher. The bird, an adult, was in Microforest 1 (30.923889, 121.971635).

Brown-chested Jungle Flycatcher is a very scarce vagrant to Shanghai. Cyornis brunneatus breeds in southeast China and spends the winter in peninsular Malaysia, Sumatra, and Borneo. It is uncommon even in its core range and virtually unknown in the Shanghai region outside Cape Nanhui; the place closest to Shanghai where I have heard of it occurring is Emeifeng, 635 km southwest of Shanghai in Fujian.

The IUCN lists the species as Vulnerable because of the loss of mature primary lowland forest throughout its range.

Brown-chested Jungle Flycatcher, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
I shoot in manual mode for fuller control. Here, using my seven-year old Nikon D3S and eight-year old Nikon 600 mm f/4, I chose the following settings: 1/160, f/11, ISO 1250. I used no tripod; instead, I steadied my rig on my knee. (Craig Brelsford)

Amur Paradise Flycatcher
Terpsiphone incei

Japanese Paradise Flycatcher
T. atrocaudata

Amur Paradise Flycatcher, Dongzhai, Henan, 2010. (Craig Brelsford)
Amur, Dongzhai, 2010. (C. Brelsford)

3 Amur found 27 Aug. at Binhai Forest Park, the heavily wooded green space near Cape Nanhui, 4.5 km inland from the East China Sea. A stunning white-morph male and rufous-morph were continuously together, and we found a single rufous-morph in another part of the park. The white-morph as well as the rufous-morph accompanying it were calling. I have seen dozens of paradise flycatchers in Shanghai over the years and heard only one call (a Japanese for 1 or 2 seconds). Why were the Amur at Binhai Forest Park calling?

Binhai Forest Park is visited little and birded even less; could this quiet, thickly wooded park hold breeding Amur Paradise Flycatcher? As the white-morph male looks like something out of a fairy tale and is a bird even a non-birder would recognize, I asked park employees whether they had seen it. All said no.

The white-morph Amur that U.S. birder Tom Hurley and I saw was only the second I had ever beheld and a first for me in Shanghai. At Dongzhai National Nature Reserve, Henan, on 5 June 2010, I photographed the white-morph shown right. The Binhai white-morph lacked the long tail feathers of the bird I saw at Dongzhai but was still an unforgettable sight.

Amur (top) and Japanese Paradise Flycatcher, Aug. 2017, Cape Nanhui. (Craig Brelsford)
Dorsal views of Amur (top) and Japanese Paradise Flycatcher. ​If the mantle, back, and tail have a purplish-brown hue, then you are likely looking at Japanese Paradise Flycatcher, known helpfully in Chinese as ‘Purple Paradise Flycatcher.’ If the upperparts are cinnamon-brown, then it is likely Amur. White-morph males are never Japanese, as the white morph does not occur in that species. 26-27 Aug. 2017, Cape Nanhui. For more on Amur-Japanese ID, see my post ID Workshop: Paradise Flycatchers. (Craig Brelsford)

Japanese Paradise Flycatcher is the more common of the two paradise flycatchers in Shanghai. The photo above shows the differences in upperpart coloration between rufous-morph Amur Paradise Flycatcher and Japanese Paradise Flycatcher.

Fairy Pitta Pitta nympha

Fairy Pitta, Microforest 4, Cape Nanhui, Shanghai. 4 Sept. 2017. (Craig Brelsford)
Fairy Pitta, Microforest 4 (30.953225, 121.959083), Cape Nanhui, 4 Sept. 2017. The first week of September seems to be peak season for these passage migrants in Shanghai. The pitta shown here is a juvenile, discernible as such by the pinkish tip to its bill. The IUCN lists Fairy Pitta as Vulnerable. (Craig Brelsford)

On 4 Sept. at Nanhui, my wife, Elaine Du, and I sneaked away from the action in Nanhui’s Microforest 1, where the photographers were set up. Microforest 4 was devoid of humans and peaceful. I tiptoed in. I scanned the undergrowth before me and, to my surprise, found a Fairy Pitta.

The pitta was standing on the ground, almost completely blanketed by a tangle of leaves, branches, and vines. Its big black eye was fixed on me. It didn’t move. I looked at the pitta, the pitta at me.

We stared at each other for 10 minutes.

Thus roosts the pitta during migration. It parks itself in thickets and waits. It bides its time, conserves its energy. Somewhere south of Shanghai, it will veer off the coast and fly non-stop across the South China Sea to Borneo, where it will spend the winter.

The pittas are mainly tropical species. Most are short-distance migrants. Not Fairy Pitta. No pitta invades the temperate world as deeply as Fairy Pitta; none makes so audacious an incursion into the north. None makes so long and daring a migration across hundreds of miles of sea.

My pitta was saving up its energy for its life-or-death run across the sea. Good luck, you explorer, you risk-taker! Good luck, Fairy Pitta.

Greater Painted-snipe
Rostratula benghalensis

Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
Nikon D3S, 600 mm f/4, 1/500, f/5.6, ISO 1000, hand-held (steadied on door of car). (Craig Brelsford)

Viewed with Elaine at dusk 3 Sept. then viewed again the next morning at dawn. For weeks, the painted-snipes have been found at a single spot (30.939534, 121.955370) in a trash-strewn canal. Earlier, when news of the painted-snipe at Cape Nanhui first broke, I wrote a post in which I regretted sharing the location where were found the painted-snipes, a rare species in Shanghai. As things stand now, I can breathe easier; the many photographers who have visited the location have had no ill effect. The birds I found 4 Sept. were aware of me but behaved normally. They fed, drank, and preened. I used my car as a blind and never got out. The painted-snipes at Nanhui tolerate photographers confined to their cars.

Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/400, f/5.6, ISO 6400. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/250, f/10, ISO 1000. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/500, f/7.1, ISO 1000. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/400, f/5.6, ISO 6400. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/250, f/5.6, ISO 6400. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/320, f/10, ISO 1000. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/200, f/5.6, ISO 6400. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/200, f/5.6, ISO 6400. (Craig Brelsford)
Greater Painted-snipe Rostratula benghalensis, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
1/250, f/9, ISO 1000. (Craig Brelsford)

Asian Dowitcher
Limnodromus semipalmatus

27 Aug., South Pond. Juvenile. Videoed by me using my iPhone 6, adapter by the U.S. company PhoneSkope, and my Swarovski ATX-95 spotting scope:

Chinese Egret Egretta eulophotes

Below, video of Chinese Egret 26 Aug. at Cape Nanhui showing differences between Chinese Egret and Little Egret.

Other highlights:

Yellow Bittern Ixobrychus sinensis

Photographed by me in gorgeous morning light 4 Sept. at Cape Nanhui.

Yellow Bittern, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)
Yellow Bittern, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)

Black Bittern Ixobrychus flavicollis

Uncommon in Shanghai. Found 26 Aug. at Cape Nanhui.

Striated Heron Butorides striata

Uncommon in Shanghai. Found 27 Aug. at Binhai Forest Park.

Crested Goshawk Accipiter trivirgatus

Adult plus another goshawk calling unseen at inner-city Zhongshan Park on 8 Sept.

I videoed the goshawks:

Pacific Golden Plover Pluvialis fulva
Grey-headed Lapwing Vanellus cinereus

27 Aug. at sod farm south of Pudong Airport.

Great Knot Calidris tenuirostris

In high-tide roost 4 Sept. on South Beach (30.860673, 121.925113), just north of Donghai Bridge at Cape Nanhui.

Curlew Sandpiper C. ferruginea

South Pond, Cape Nanhui, 26 Aug. Video:

Pin-tailed Snipe Gallinago stenura

Pin-tailed Snipe, 3 Sept. 2017, Cape Nanhui. (Craig Brelsford)
Pin-tailed Snipe, 3 Sept. 2017, Cape Nanhui. (Craig Brelsford)

Party of 3 on 26 Aug. at Cape Nanhui. When flushed, made loud, raspy, memorable call. I quickly compared the call I had just heard to calls of Pin-tailed Snipe downloaded from xeno-canto.org to my iPhone. The match was perfect. Lookalike Swinhoe’s Snipe rarely calls when flushed. Dark underwing clear in my many photographs of the trio. Flew high when flushed, then returned to land at point only 50 m from where originally flushed.

Gull-billed Tern Gelochelidon nilotica

Gull-billed Tern, 4 Sept. 2017, Cape Nanhui, Pudong, Shanghai. (Craig Brelsford)
Gull-billed Tern, 4 Sept., Cape Nanhui. Note the thick bill. (Craig Brelsford)

The canals on the inland side of the sea wall were resounding with the characteristic yaps of this passage migrant. A clear photo is especially useful for discerning the thick bill.

Lesser Cuckoo Cuculus poliocephalus

Lesser Cuckoo, 26 Aug. 2017, Cape Nanhui, Shanghai. (Craig Brelsford)
Lesser Cuckoo, 26 Aug., Cape Nanhui. (Craig Brelsford)

Non-hepatic adult 26 Aug. at Cape Nanhui. See photo above. Reasoning behind ID of Lesser Cuckoo:

(1) No suggestion of brighter yellow iris that is characteristic of Eurasian Cuckoo as well as Oriental and Himalayan Cuckoo (darker iris more characteristic of Indian Cuckoo and Lesser Cuckoo)

(2) Dark rump and uppertail coverts contrast little with dark tail, while dark tail and rump contrast markedly with paler back, all pointing to Lesser Cuckoo

(3) On tail, very likely no subterminal black band (as in Indian Cuckoo), pointing again to Lesser Cuckoo

Cuculus sp., 4 Sept. 2017, Cape Nanhui. (Craig Brelsford)
This cuckoo, seen 4 Sept. 2017 at Cape Nanhui, has the dark eye, well-defined and widely spaced barring, and small size suggestive of Lesser Cuckoo. (Craig Brelsford)

Pale-legged Leaf Warbler
Phylloscopus tenellipes

Sakhalin Leaf Warbler

P. borealoides

In the wake of my post of 31 Aug. 2017 about distinguishing Pale-legged from Sakhalin Leaf Warbler by call, I was hoping to find more members of this species pair. On 4 Sept. 2017 at Pudong’s Cape Nanhui, I was richly rewarded. For more, see my 10 Sept. 2017 post, “Pale-Sak Calls: An Addendum.”

Sand Martin Riparia riparia

Sand Martin, Cape Nanhui, 4 Sept. (Craig Brelsford)
Sand Martin, Cape Nanhui, 4 Sept. 2017. (Craig Brelsford)

Riparia riparia is an uncommon passage migrant in Shanghai. Note the well-defined breast band on my bird, distinguishing it from Pale Martin Riparia diluta, which has an ill-defined breast band.

Siberian Blue Robin Larvivora cyane

It’s worth stressing how good is our opportunity here in Shanghai to view Siberian Blue Robin for a few short weeks each spring and fall. On the breeding grounds up in northern China, the males sing loudly and beautifully but are very hard to see; no Siberian Blue Robin I experienced on the breeding grounds ever sang from anything like an exposed perch. The few I was able to see in Elaine’s hometown of Boli, Heilongjiang sang on or near the ground. Females are almost impossible to see; in fact, I saw not one in Heilongjiang in May-June 2016. Siberian Blue Robin are also apparently hard to see on their wintering grounds in south China and Southeast Asia. Places such as Cape Nanhui are probably among the best places in the world to view this common but shy species. We Shanghai birders have yet another reason to count ourselves lucky.

Also noted by me in Shanghai 27 Aug.-8 Sept. 2017:

Garganey Spatula querquedula
Common Pheasant Phasianus colchicus
Little Grebe Tachybaptus ruficollis
Grey Heron Ardea cinerea
Purple Heron A. purpurea
Great Egret A. alba
Intermediate Egret A. intermedia
Little Egret Egretta garzetta
Eastern Cattle Egret Bubulcus coromandus
Black-crowned Night Heron Nycticorax nycticorax
Chinese Pond Heron Ardeola bacchus
Common Moorhen Gallinula chloropus
Eurasian Coot Fulica atra
Black-winged Stilt Himantopus himantopus
Pied Avocet Recurvirostra avosetta
Kentish Plover Charadrius alexandrinus
Lesser Sand Plover C. mongolus
Greater Sand Plover C. leschenaultii
Little Ringed Plover C. dubius
Whimbrel Numenius phaeopus
Far Eastern Curlew N. madagascariensis
Eurasian Curlew N. arquata
Black-tailed Godwit Limosa limosa
Ruddy Turnstone Arenaria interpres
Red Knot Calidris canutus
Broad-billed Sandpiper C. falcinellus
Sharp-tailed Sandpiper C. acuminata
Long-toed Stint C. subminuta
Red-necked Stint C. ruficollis
Sanderling C. alba
Dunlin C. alpina
Common Snipe Gallinago gallinago
Red-necked Phalarope Phalaropus lobatus
Common Sandpiper Actitis hypoleucos
Grey-tailed Tattler Tringa brevipes
Spotted Redshank T. erythropus
Common Greenshank T. nebularia
Marsh Sandpiper T. stagnatilis
Wood Sandpiper T. glareola
Common Redshank T. totanus
Oriental Pratincole Glareola maldivarum
Black-tailed Gull Larus crassirostris
White-winged Tern Chlidonias leucopterus
Whiskered Tern C. hybrida
Common Tern Sterna hirundo
Feral Pigeon (Rock Dove) Columba livia
Red Turtle Dove Streptopelia tranquebarica
Spotted Dove S. chinensis
Himalayan Swiftlet Aerodramus brevirostris
Lesser Coucal Centropus bengalensis
Oriental Dollarbird Eurystomus orientalis
Eurasian Wryneck Jynx torquilla
Common Kingfisher Alcedo atthis
Common Kestrel Falco tinnunculus
Black-winged Cuckooshrike Coracina melaschistos
Tiger Shrike Lanius tigrinus
Brown Shrike L. cristatus
Long-tailed Shrike L. schach
Black-naped Oriole Oriolus chinensis
Japanese Tit Parus minor
Black-throated Bushtit Aegithalos concinnus
Japanese White-eye Zosterops japonicus
Barn Swallow Hirundo rustica
Light-vented Bulbul Pycnonotus sinensis
Arctic/Kamchatka Leaf/Japanese Leaf Warbler Phylloscopus borealis/examinandus/xanthodryas
Eastern Crowned Warbler P. coronatus
Oriental Reed Warbler Acrocephalus orientalis
Thick-billed Warbler Iduna aedon
Zitting Cisticola Cisticola juncidis
Plain Prinia Prinia inornata
Reed Parrotbill Paradoxornis heudei
Vinous-throated Parrotbill Sinosuthora webbiana
Javan Myna Acridotheres javanicus
Crested Myna A. cristatellus
Chinese Blackbird Turdus mandarinus
Grey-streaked Flycatcher Muscicapa griseisticta
Asian Brown Flycatcher M. dauurica
Oriental Magpie-Robin Copsychus saularis
Blue-and-white Flycatcher Cyanoptila cyanomelana
Yellow-rumped Flycatcher Ficedula zanthopygia
Chinese Grosbeak Eophona migratoria
Eurasian Tree Sparrow Passer montanus
Eastern Yellow Wagtail Motacilla tschutschensis tschutschensis
White Wagtail M. alba

Featured image: All-star birds of late summer 2017 at Pudong’s Cape Nanhui: Clockwise from top left, Brown-chested Jungle Flycatcher, Fairy Pitta, Greater Painted-snipe, and Great Knot. The Brown-chested Jungle Flycatcher and Greater Painted-snipe were photographed 4 Sept. 2017 at Cape Nanhui. Fairy Pitta photographed 5 June 2010 in Dongzhai, Henan, and Great Knot photographed 11 Sept. 2014 at Yangkou, Rudong, Jiangsu. (Craig Brelsford)

Pale-Sak Calls: An Addendum

In the wake of my recent post on distinguishing Pale-legged Leaf Warbler from Sakhalin Leaf Warbler by call, I have been hoping to find more members of this species pair in Shanghai. On 4 Sept. 2017 at Pudong’s Cape Nanhui, my hopes were fulfilled in a big way. At the Magic Parking Lot (30.884889, 121.968222), not one but both species were calling.

Below, the recordings I made with my Olympus DM-650 pocket recorder. The first Sakhalin recording was made at Microforest 4 (30.953225, 121.959083), 7.7 km north of the Magic Parking Lot on the coastal road. The others were made at the Magic Parking Lot.

Note the higher frequency of the calls of Pale-legged—on average a full kilohertz higher. The difference is discernible by the keen listener, but nothing tells the story better than the spectrograms.

To summarize what I argued in the previous post: The calls, as well as the very distinctive songs, of Pale-legged Leaf Warbler and Sakhalin Leaf Warbler are diagnostic—that is, they differ markedly and consistently and are a reliable basis for an ID. The diagnosability of the calls of the two species has been affirmed by various researchers, among them Yap et al. (2014; Birding Asia 21: 76–81).

Sakhalin Leaf Warbler Phylloscopus borealoides, call, Microforest 4 (30.953225, 121.959083), Cape Nanhui, Pudong, Shanghai, 4 Sept. 2017 (00:02; 528 KB)

Audio spectrogram of call of Sakhalin Leaf Warbler.

Sakhalin Leaf Warbler, call, Magic Parking Lot (30.884889, 121.968222), Cape Nanhui, Pudong, Shanghai, 4 Sept. 2017 (00:07; 1.4 MB)

Audio spectrogram of call of Sakhalin Leaf Warbler.

Pale-legged Leaf Warbler Phylloscopus tenellipes, call, Magic Parking Lot, 4 Sept. 2017 (00:19; 3.7 MB)

Audio spectrogram of call of Pale-legged Leaf Warbler.

Pale-legged Leaf Warbler, call, Magic Parking Lot, 4 Sept. 2017 (00:41; 7.9 MB)

Audio spectrogram of call of Pale-legged Leaf Warbler.

Pale-legged Leaf Warbler, call, Magic Parking Lot, 4 Sept. 2017 (00:10; 2 MB)

Audio spectrogram of call of Pale-legged Leaf Warbler.

Pale-legged Leaf Warbler, call, Magic Parking Lot, 4 Sept. 2017 (00:01; 332 KB)

Audio spectrogram of call of Pale-legged Leaf Warbler.

Featured image: Pale-legged/Sakhalin Leaf Warbler, Jiangsu, May. Some of the salient characteristics of Pale-Sak are pointed out. Separating Pale-legged from Sakhalin on the basis of plumage and bare parts is not possible; because this bird was neither singing nor calling, it cannot be determined to which of the two species it belongs. (Craig Brelsford)

Separating Pale-legged & Sakhalin Leaf Warbler on Call

Editor’s note: In the photo above, a Pale-legged Leaf Warbler emits its characteristic “tink” call in Microforest 4, Cape Nanhui, Pudong, 27 Aug. 2017. The tink call of Pale-legged is appreciably higher-pitched than that of Sakhalin Leaf Warbler. Distinguishing the two calls is the subject of this post. — Craig Brelsford

Last September, in “Pale-legged Leaf Warbler & the Shanghai Big 5,” I asserted that “Pale-legged Leaf Warbler is safely separable from Sakhalin Leaf Warbler only by song.” I was wrong. Call as well as song is a reliable separator. In this post, I am going to tell you how I arrived at this insight, and I will show you how you too can achieve clear, indisputable ticks of these tricky species through call alone.

Experts since at least as far back as 1989 have been arguing that Pale-legged Leaf Warbler Phylloscopus tenellipes and Sakhalin Leaf Warbler P. borealoides are separable not only by their distinctive songs but also by their calls. Thailand-based birder and shanghaibirding.com contributor Phil Round is among those making that argument. Round and his co-authors write: “[T]he call of P. tenellipes is markedly higher in frequency than that of P. borealoides” (Round et al., “Addition of Kamchatka Leaf Warbler Phylloscopus examinandus and Sakhalin Leaf Warbler P. borealoides to Thailand’s Avifauna,” downloadable through shanghaibirding.com).

If your ear is good, or even if your ear is just average and you have a sound-recorder, then you too can appreciate the higher frequency of the call of Pale-legged. A sound-recorder is very important, because if you upload your recordings to databases such as eBird and the Macaulay Library, then you will be able to “see” the sound in the audio spectrogram.

Our first exhibit is the spectrogram of a call I sound-recorded of Sakhalin Leaf Warbler on 8 May 2016 in Cape Nanhui’s Microforest 4 (30.953225, 121.959083). The frequency is 4.8 kilohertz, a number that matches closely the frequency of Sakhalin calls on xeno-canto.org.

Audio spectrogram of call of Sakhalin Leaf Warbler.

Here is the sound-recording:

Sakhalin Leaf Warbler, call, Microforest 4 (30.953225, 121.959083), 8 May 2016 (00:15; 1 MB)

Now consider the spectrograms and sound-recordings of Pale-legged Leaf Warbler below. The spectrogram immediately below was recorded by me on 10 June 2016 in my wife Elaine Du’s hometown of Boli, Heilongjiang, part of the breeding range of Pale-legged Leaf Warbler. The call (here a grace note) and song both clock in at about 6 kHz, a frequency a full 25 percent higher than the call of Sakhalin Leaf Warbler and, as with Sakhalin, consistent with the frequencies of Pale-legged calls on xeno-canto.org.

Audio spectrogram of call plus song of Pale-legged Leaf Warbler.

Here is the sound-recording:

Pale-legged Leaf Warbler, call and song, Xidaquan National Forest (45.727751, 130.317316), Boli, Heilongjiang, 10 June 2016 (01:59; 6 MB)

The spectrogram below is of a brief sound-recording I made in Microforest 4 this past Sunday. The song element of this passage migrant is absent (though note that I have heard Pale-legged and Sakhalin singing in Shanghai in spring). The call has a frequency of 5.9 kHz and clearly belongs to Pale-legged Leaf Warbler.

Audio spectrogram of call of Pale-legged Leaf Warbler.

The sound-recording:

Pale-legged Leaf Warbler, call, Microforest 4 (30.953225, 121.959083), 27 Aug. 2017 (00:01; 193 KB)

Why should you care about all this? Because prepared birders have a chance to get solid ticks of “Pale-Saks” that are merely calling and not necessarily singing. If you hear a Pale-Sak calling and trust your ear (or better yet, sound-record the call and later analyze the spectrogram), then you may be able to go beyond the safe, boring record of “Pale-legged/Sakhalin Leaf Warbler” to a more satisfying full tick.

Pale-legged Leaf Warbler Phylloscopus tenellipes pumping its tail vigorously while remaining otherwise motionless and while standing (as is its wont) on a thick branch (top panels); and a second individual making its high-pitched "tink" call (bottom panels). Microforest 4 (30.953225, 121.959083, top panels) and Microforest 1 (30.923889, 121.971635, bottom panels), Cape Nanhui, Pudong, Shanghai, China, 27 Aug. 2017.
Pale-legged Leaf Warbler Phylloscopus tenellipes performing typical behaviors. Top panels: pumping tail vigorously while remaining otherwise motionless on a sturdy branch. Bottom panels: making the high-pitched ‘tink’ call, again on a thick branch. Microforest 4 (30.953225, 121.959083, top panels) and Microforest 1 (30.923889, 121.971635, bottom panels), Cape Nanhui, 27 Aug. 2017. (Craig Brelsford)

Accurate, plentiful records from Shanghai will help researchers such as Round get a clearer picture of the movements and population of these understudied species. As Round et al. write: “Increased sampling of migrants may also resolve the differences in timing of passage between P. examinandus and P. borealis on the one hand, and P. borealoides and P. tenellipes on the other” (“Addition”; hyperlink mine).

My trusty Olympus DM-650 sound recorder. In May, the height of migration season, my sound recorder is like the American Express card: 'Don't Leave Home Without It!'
My Olympus DM-650

What’s more, you do not need to spend much or even know much to record good audio. My Olympus DM-650 costs less than US$250. I have no microphone other than the one built into my pocket recorder, and I possess no parabola. I record in lossless 48kHz .wav. The very scientific-looking spectrograms displayed in this post are generated automatically by eBird and Macaulay.

In Shanghai and throughout China, important facts about common birds such as Pale-legged Leaf Warbler and Sakhalin Leaf Warbler remain unknown. This ornithological semi-wilderness is both difficult and exciting. If we rise to the challenge and become better birders, then we will make new discoveries and blaze a trail of knowledge for future birders to follow.

Greater Painted-snipe at Nanhui

I birded 10-14 Aug. 2017 with visiting U.S. birder Bob Orenstein. We noted 107 species at coastal sites in Shanghai and southeastern Jiangsu. At Pudong’s Cape Nanhui on 13 Aug., Bob and I had a rare Shanghai record of Greater Painted-snipe (above) and an early record of Mandarin Duck. On 12 Aug. at Dongling (32.224520, 121.534355), an impressive site that I had never birded, we had critically endangered Spoon-billed Sandpiper and 2605 endangered Great Knot. We saw 4 Nordmann’s Greenshank at Dongling and had 30 members of that endangered species 11 Aug. at the coastal birding area (32.757056, 120.952294) at Dongtai. We noted Himalayan Swiftlet at Dongling as well as on 10 Aug. at Cape Nanhui, where we also had Amur Paradise Flycatcher.

Dongling is only 185 km north of People’s Square in Shanghai, closer than the declining old hot spot of Yangkou (“Rudong”) and the Dongtai coastal areas. Through a steady rain 12 Aug., Bob and I found high-tide roosts containing seas of Great Knot plus a single lonely Spoon-billed Sandpiper in complete winter plumage.

Seeing so many Great Knot was extremely heartening. In stark contrast, however, was endangered Far Eastern Curlew, of which only 5 were noted. Unlike near-threatened Eurasian Curlew (130), which though not abundant at Dongling numbered in the thousands at coastal Dongtai, Far Eastern Curlew were abundant nowhere.

On 11 Aug. Bob and I birded the reclaimed area of eastern Hengsha Island. The place was a bustle of activity, even at 5:15 in the morning, with 18-wheelers and dump trucks rumbling by. Security was tight. Guards were stationed at every intersection and in roving vans, one of which stopped us. We told them our purpose was birding; they told us to leave.

Before getting kicked out, Bob and I enjoyed one of my best moments ever with near-threatened Reed Parrotbill. A mega-flock of about 50 birds, much larger than the flocks one sees in the smaller, and ever-shrinking, reedy areas at Cape Nanhui, was making a loud noise during a morning feed. The flock contained juveniles and adults and proved that, provided it has habitat in which to flourish, Reed Parrotbill is a common, even dominant, reed-bed specialist.

I sound-recorded the raucous parrotbills:

Reed Parrotbill, 31.307498, 121.895095, 11 Aug. 2017 (02:39; 30.7 MB)

Let’s look more closely at some of our birds.

Greater Painted-snipe Rostratula benghalensis

Greater Painted-snipe Rostratula benghalensis. © Craig Brelsford (craigbrelsford.com, shanghaibirding.com). 13 Aug. 2017. Cape Nanhui, Pudong, Shanghai, China.
Greater Painted-snipe Rostratula benghalensis. We found the birds in a canal at Cape Nanhui, where they likely are breeding.

​With the help of local Chinese birders, Bob and I found a pair of Greater Painted-snipe in a thickly vegetated, trash-strewn canal. The shy birds were aware of our presence and nervous, but they held their ground. That behavior, in combination with a photo another Chinese birder took suggesting that the male is brooding, persuaded us that the pair has a nest. We moved quickly away and did not return.

Nordmann’s Greenshank Tringa guttifer

Footage I got 11 Aug. at Dongtai figures prominently in this video I made comparing Nordmann’s Greenshank to Common Greenshank.

To further hone your Nordmann’s Greenshank ID skills, and to relive the exciting appearance in 2016 of Nordmann’s Greenshank in Shanghai, see my post, Your Handy-Dandy Nordmann’s Greenshank ID Primer!

Great Knot Calidris tenuirostris

Great Knot was the star of this four-wader movie I made at Dongling.

Pin-tailed/Swinhoe’s Snipe Gallinago stenura/megala

The video below records one of my closest encounters ever with “Swintail” Snipe. I found this individual 14 Aug. at the sod farm (31.103100, 121.829300) south of Pudong International Airport.

The video shows some of the characters distinguishing this species pair from Common Snipe. (The two species themselves are, except in extraordinary circumstances, indistinguishable from one another.)

As the autumn migration season progresses, the sod farm bears checking; on 3 Sept. 2016 at the farm, my partners and I had a rare Shanghai record of Common Ringed Plover.

​The video of the snipe as well as the other two videos embedded into this post were made with my combination of iPhone 6 plus PhoneSkope adapter plus Swarovski ATX-95. This powerful combination allows the videographer to shoot usable video from a great distance, allowing even a shy snipe to act naturally. (I never got closer than 40 m to the snipe.)

Amur Paradise Flycatcher Terpsiphone incei

Amur Para Fly
Amur Paradise Flycatcher, Microforest 1 (30.923889, 121.971635), 10 Aug. Among the indicators of Amur are the rufous upperparts and tail as well as the indistinct border between breast and belly. (Craig Brelsford)

It was an exciting moment 10 Aug. when Amur Paradise Flycatcher appeared in Microforest 1 (30.923889, 121.971635). In the photo above, note the indistinct border between the bluish hood and white belly and the two-tone coloration of the hood–darker blue head, lighter blue breast. In Japanese Paradise Flycatcher, the hood tends to be uniformly colored and the border between the hood and white breast more distinct.

With this year’s fall migration season getting into full swing, paradise flycatchers are going to be moving through Shanghai, and you may wish to improve your skills. For more on separating Amur Paradise Flycatcher from Japanese Paradise Flycatcher, see my post from 2016, “ID Workshop: Paradise Flycatchers.”

Cuculus sp.

Adults and some juveniles are now moving through Shanghai. In a few weeks, nearly all adult Cuculus cuckoos will be gone, and we will be left with the juveniles. Cuckoos do not sing in autumn, and song of course is by far the best way of distinguishing among the Cuculus cuckoos of our region. I therefore almost invariably mark these silent birds “Cuculus sp.”

Let us say I assigned these silent cuckoos to Common Cuckoo Cuculus canorus. Perhaps they were the size of a sparrowhawk (ruling out thrush-sized Lesser Cuckoo C. poliocephalus), and perhaps they even had yellow irides (ruling out dark-eyed Indian Cuckoo C. micropterus and providing yet more evidence against dark-eyed Lesser Cuckoo).

Even if my cuckoos passed these tests, unless they were singing the classic song (virtually unheard this time of year), how could I justify ID-ing them as Common? It is, of course, likely that some of them are Common, but how can one be sure that any given silent Cuculus cuckoo one is seeing is Common?

I refrain from making speculative species assignments. I refrain because we still do not know enough about the migration patterns in Shanghai of Oriental Cuckoo C. optatus and Himalayan Cuckoo C. saturatus.

Like so many of the woodland passerines that pass through Shanghai on migration, Oriental Cuckoo breeds in northeastern China. Like those woodland passerines, Oriental Cuckoo also may pass through Shanghai on migration. Oriental, of course, is very similar to Common, the two species having so many overlapping characters that a firm ID of non-photographed, non-singing birds is all but impossible; and Himalayan, which theoretically may be present in or near our region, is even more similar to Oriental (“virtually identical”—Mark Brazil, Birds of East Asia, p. 256).

In Shanghai it may be tempting to assign silent Cuculus cuckoos, particularly yellow-eyed adults, to Common Cuckoo. Before I ever started doing that, though, I would want to know more about Oriental Cuckoo and Himalayan Cuckoo in the Shanghai region. Maybe future studies, using captured cuckoos whose DNA has been analyzed, will reveal a surprising pattern of Cuculus migration in Shanghai. Maybe those studies will show that considerable numbers of Cuculus passage migrants are Oriental Cuckoo.

Until that day comes, I usually hold back from ID-ing non-singing Cuculus cuckoos.

For more information on Shanghai-area cuckoos, see my post, “The Cuckoos of Shanghai.”

Himalayan Swiftlet Aerodramus brevirostris

Himalayan Swiftlet Aerodramus brevirostris. © Craig Brelsford (craigbrelsford.com, shanghaibirding.com). 10 Aug. 2017. Near Cathedral of Birding at N end of Microforest 4 (30.953225, 121.959083), Cape Nanhui, Pudong, Shanghai, China.
Himalayan Swiftlet Aerodramus brevirostris. Near Cathedral of Birding at north end of Microforest 4 (30.953225, 121.959083), Cape Nanhui, 10 Aug. 2017. (Craig Brelsford)

​After being nearly unheard of in Shanghai as recently as a few years ago, Himalayan Swiftlet is now more and more regularly recorded in Shanghai in both spring and autumn.

Join Shanghai Birding for the very latest bird sightings in Shanghai.
Join Shanghai Birding for the very latest bird sightings in Shanghai.

The question arises of whether Himalayan Swiftlet has always been a scarce passage migrant and overlooked or whether its numbers are increasing in our area. It is of course also possible that both its numbers are increasing in our area and local birders’ skills and communication methods are improving.

That communication methods are improving is indisputable. One of the main causes of the improved communication is the WeChat group I founded, Shanghai Birding. The members of that group, who range from the newest of newbies to some of the most expert birders in China, regularly exchange sightings in real-time.

To join Shanghai Birding, friend me on WeChat (WeChat ID: craigbrelsford). Tell me that you wish to join Shanghai Birding. I’ll add you.

Here is the complete list of the birds noted by Bob Orenstein and me 10-14 Aug. 2017:

Ruddy Shelduck Tadorna ferruginea
Mandarin Duck Aix galericulata
Eastern Spot-billed Duck Anas zonorhyncha
Common Pheasant Phasianus colchicus
Little Grebe Tachybaptus ruficollis
Great Crested Grebe Podiceps cristatus
Great Cormorant Phalacrocorax carbo
Yellow Bittern Ixobrychus sinensis
Cinnamon Bittern I. cinnamomeus
Grey Heron Ardea cinerea
Purple Heron A. purpurea
Great Egret A. alba
Intermediate Egret A. intermedia
Little Egret Egretta garzetta
Eastern Cattle Egret Bubulcus coromandus
Chinese Pond Heron Ardeola bacchus
Striated Heron Butorides striata
Black-crowned Night Heron Nycticorax nycticorax
Eastern Marsh Harrier Circus spilonotus
White-breasted Waterhen Amaurornis phoenicurus
Common Moorhen Gallinula chloropus
Eurasian Coot Fulica atra
Black-winged Stilt Himantopus himantopus
Eurasian Oystercatcher Haematopus ostralegus
Grey Plover Pluvialis squatarola
Pacific Golden Plover P. fulva
Grey-headed Lapwing Vanellus cinereus
Lesser Sand Plover Charadrius mongolus
Greater Sand Plover C. leschenaultii
Kentish Plover C. alexandrinus
Little Ringed Plover C. dubius
Greater Painted-snipe Rostratula benghalensis
Whimbrel Numenius phaeopus
Far Eastern Curlew N. madagascariensis
Eurasian Curlew N. arquata
Bar-tailed Godwit Limosa lapponica
Black-tailed Godwit L. limosa
Ruddy Turnstone Arenaria interpres
Great Knot Calidris tenuirostris
Red Knot C. canutus
Broad-billed Sandpiper C. falcinellus
Sharp-tailed Sandpiper C. acuminata
Long-toed Stint C. subminuta
Spoon-billed Sandpiper C. pygmea
Red-necked Stint C. ruficollis
Sanderling C. alba
Dunlin C. alpina
Pin-tailed/Swinhoe’s Snipe Gallinago stenura/megala
Terek Sandpiper Xenus cinereus
Red-necked Phalarope Phalaropus lobatus
Common Sandpiper Actitis hypoleucos
Grey-tailed Tattler Tringa brevipes
Spotted Redshank T. erythropus
Common Greenshank T. nebularia
Nordmann’s Greenshank T. guttifer
Marsh Sandpiper T. stagnatilis
Wood Sandpiper T. glareola
Common Redshank T. totanus
Saunders’s Gull Chroicocephalus saundersi
Black-headed Gull C. ridibundus
Black-tailed Gull Larus crassirostris
Little Tern Sternula albifrons
Gull-billed Tern Gelochelidon nilotica
Caspian Tern Hydroprogne caspia
White-winged Tern Chlidonias leucopterus
Whiskered Tern C. hybrida
Common Tern Sterna hirundo
Feral Pigeon (Rock Dove) Columba livia
Red Turtle Dove Streptopelia tranquebarica
Spotted Dove S. chinensis
Lesser Coucal Centropus bengalensis
Cuculus sp.
Himalayan Swiftlet Aerodramus brevirostris
Eurasian Hoopoe Upupa epops
Common Kingfisher Alcedo atthis
Common Kestrel Falco tinnunculus
Peregrine Falcon F. peregrinus
Brown Shrike Lanius cristatus
Long-tailed Shrike L. schach
Amur Paradise Flycatcher Terpsiphone incei
Eurasian Magpie Pica pica
Oriental Skylark Alauda gulgula
Pale Martin Riparia diluta
Barn Swallow Hirundo rustica
Red-rumped Swallow Cecropis daurica
Asian House Martin Delichon dasypus
Japanese Tit Parus minor
Light-vented Bulbul Pycnonotus sinensis
Arctic/Kamchatka Leaf Warbler Phylloscopus borealis/examinandus
Eastern Crowned Warbler P. coronatus
Oriental Reed Warbler Acrocephalus orientalis
Zitting Cisticola Cisticola juncidis
Plain Prinia Prinia inornata
Reed Parrotbill Paradoxornis heudei
Vinous-throated Parrotbill Sinosuthora webbiana
Red-billed Starling Spodiopsar sericeus
White-cheeked Starling S. cineraceus
Crested Myna Acridotheres cristatellus
Chinese Blackbird Turdus mandarinus
Asian Brown Flycatcher Muscicapa dauurica
Oriental Magpie-Robin Copsychus saularis
Yellow-rumped Flycatcher Ficedula zanthopygia
Blue Rock Thrush Monticola solitarius
Eurasian Tree Sparrow Passer montanus
Scaly-breasted Munia Lonchura punctulata
White Wagtail Motacilla alba
Chinese Grosbeak Eophona migratoria

Asian Dowitcher in Shanghai

On Sat. 5 Aug. 2017, I resumed birding at Pudong’s Cape Nanhui after a two-month hiatus. Battling apparent temperatures of 42 degrees Celsius (108 degrees Fahrenheit), partner Ian Reid (above) and I noted 74 species. The haul was good, but even better was the insight it afforded me. Once again, I learned that when it comes to birding, the most southeasterly point of Earth’s Greatest City delivers month after month, season after season.

Ian and I had 3 juvenile Asian Dowitcher, the most notable among an all-star team of shorebirds that included 8 Black-tailed Godwit, Ruff, 12 Broad-billed Sandpiper, and 3 Curlew Sandpiper still mainly in brick-red breeding plumage. A Red-necked Phalarope was making use of fallow rice paddies, and 6 Grey-tailed Tattler were on the mudflats near Donghai Bridge. We had unusual Nanhui records of Pied Kingfisher and Ruddy Shelduck.

The microforests were quiet, but a very early record of Eastern Crowned Warbler and Yellow-rumped Flycatcher offered a preview of the passerine party coming in September. We had four species of bittern: Eurasian Bittern, Yellow Bittern, Cinnamon Bittern, and Black Bittern.

In my nearly 10 years in Shanghai, I had never birded Cape Nanhui in the first week of August. During Shanghai’s hottest month of the year, I am almost always birding in cooler climes—in Qinghai last year, for example, and in 2015 in my wife Elaine’s hometown in Heilongjiang.

Ian’s and my day both reminded me of the good reasons for vacating Shanghai this time of year and showed me the treasures I have been missing. Through the oppressive heat, which ensured that you would never stop sweating, and the 81-percent humidity, which ensured that the perspiration wouldn’t do much good, the Australian birder and I steadily built up an impressive list.

For all 74 species, see our eBird list. Below, our highlights.

Asian Dowitcher Limnodromus semipalmatus

Asian Dowitcher through the spotting scope and recorded by my iPhone 6. 5 Aug. 2017. (Craig Brelsford)
Asian Dowitcher at South Pond, 5 Aug. 2017. Photo taken with iPhone 6 and PhoneSkope adapter attached to my Swarovski ATX-95 spotting scope. (Craig Brelsford)

Our trio were juveniles, with their dark-brown crowns and buff-fringed, dark-brown upperparts. They were feeding together at South Pond (30.873934, 121.953180). The tide had hit the nearby sea wall and driven in small numbers of shorebirds of various species, among them Sharp-tailed Sandpiper Calidris acuminata, Curlew Sandpiper C. ferruginea, Long-toed Stint C. subminuta, and Broad-billed Sandpiper C. falcinellus.

An East Asian specialty, Asian Dowitcher breeds in a disjointed set of ranges from western Siberia to Heilongjiang. The IUCN lists it as Near Threatened.

Eastern Crowned Warbler Phylloscopus coronatus

We found a single individual in the Cathedral of Birding, the broad, spacious northern end of Microforest 4 (30.953225, 121.959083). This is a very early record of a species that, like so many other passerines on passage through the Shanghai region, does not begin to show up in impressive numbers until September. As with the dowitchers, when I saw this warbler, my initial reaction was, “What else have you been missing over the years for failing to bird Nanhui in early August?”

Nearby we had female Yellow-rumped Flycatcher Ficedula zanthopygia, a less surprising record, as the species breeds in Jiangsu.

Ruddy Shelduck Tadorna ferruginea

Ruddy Shelduck, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)
Ruddy Shelduck, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)

Ruddy Shelduck in August is yet another unexpected record. We found a single individual associating with domestic waterfowl near the entrance to the defunct wetland reserve (30.920507, 121.973159). The species is uncommon in Shanghai at any time of year, with most records coming in winter.

Pied Kingfisher Ceryle rudis

Perhaps the most surprising aspect of this record is that it is surprising at all. Pied Kingfisher breeds throughout southern China, yet this record was my first of the species in Shanghai. A pair has been present at Cape Nanhui since at least July.

Eurasian Bittern Botaurus stellaris

Eurasian Bittern, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)
The boom of Eurasian Bittern is heard in Shanghai in spring. An August record is surprising. (Craig Brelsford)

Our first of the four species of bittern. We found 2.

Yellow Bittern Ixobrychus sinensis

Yellow Bittern, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)
Yellow Bittern breeds in our area. (Craig Brelsford)

We found 24 of this local breeder along the length of the 30-km coastal road.

Cinnamon Bittern Ixobrychus cinnamomeus

Cinammon Bittern, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)
Cinnamon Bittern is another species that in Shanghai probably has been under-recorded over the years. (Craig Brelsford)

Found in habitats similar to Yellow Bittern, but in much smaller numbers (4).

Black Bittern Ixobrychus flavicollis

Black Bittern, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)
Black Bittern, Cape Nanhui, 5 Aug. 2017. (Craig Brelsford)

One was seen flying just north of Eiffel Tower (30.850531, 121.878047). This species has an affinity for swamps in forests and is uncommon in Shanghai. Saturday’s record was only my second in the city.

Common Kestrel Falco tinnunculus

Common Kestrel Falco tinnunculus being mobbed by Black-winged Stilt Himantopus himantopus. © Craig Brelsford (craigbrelsford.com, shanghaibirding.com). 5 Aug. 2017. Cape Nanhui, Pudong, Shanghai, China.
Juvenile Common Kestrel blundered into a confrontation with Black-winged Stilt. The youngster soon realized its error and went looking for littler prey. (Craig Brelsford)

A species common in Shanghai, noted here only because of the circumstances under which Ian and I found it. The first impression of “juvenile falcon” that I received came not from the plumage but from the blunders of the kestrel. The falcon got too close to some juvenile Black-winged Stilt–and found itself being chased off by an adult, a giant in comparison. This was clearly a rookie’s error and betrayed the inexperience of the attacker.

In the photo above, note the lightly streaked ear coverts, the lack of scythe-like wings (as in Eurasian Hobby), black remiges, and long tail with rounded tip. The strong black streaking on the underparts will grow thinner as the kestrel matures.

Peregrine Falcon Falco peregrinus

A welcome addition to any Nanhui list, Falco peregrinus is usually recorded in Shanghai in autumn and winter. Sharp-eyed Ian spotted the falcon roosting in an area that used to contain reed beds but has since been flattened by the backhoes into a savanna-like landscape. I got video on my iPhone through the spotting scope.

Featured image: Australian birder Ian Reid scans the mudflats at Cape Nanhui, Pudong, 5 Aug. 2017. In the background is Donghai Bridge. (Craig Brelsford)

GUEST POST: Notes on Kamchatka Leaf Warbler, by Philip D. Round

by Philip D. Round
for shanghaibirding.com

Regarding the comment by Dr. Nial Moores in the shanghaibirding.com post Kamchatka Leaf Warbler in Shanghai (6 June 2017): I would agree that both Arctic Warbler Phylloscopus borealis and Kamchatka Leaf Warbler P. examinandus may come through late, alongside each other, even in mid- to late May.

Here in Thailand, I think our earliest Kamchatka (diagnosed on wing length, greater than 70 mm) was 14 April, caught on Man Nai Island (12.015924, 102.283475) at the same time (so far) as our only undoubted Japanese Leaf Warbler P. xanthodryas.

While on average Kamchatka may be slightly larger-billed, and the respective sexes larger and longer-winged than Arctics, there is not much in it. Anybody who expects to be able to call birds one or the other in the field on anything other than voice is stretching credibility, I feel. Plumage overlap seems total. And of course on body size and wing length there is overlap between male Arctic and female Kamchatka.

The featured image above shows two individuals, with two photos each. Both were freshly moulted birds caught on northwards spring passage at Laem Phak Bia (13.050000, 100.083333), Phetchaburi, Thailand. Both were picked out as being slightly more brightly yellowish on underparts and on supercilium than typical spring borealis (caught on the same day), and brighter green above.

The bird in panels 1 and 2 was caught 14 May 2011. Measurements were wing 66 mm, bill 14.5 mm. On mt DNA (COI) we determined that it was examinandus. The identically bright-coloured individual in panels 3 and 4 was caught on the same day. Measurements were wing 62 mm, bill 14.5 mm. It was borealis on DNA.

The paper of which this comparison was a part is titled “Addition of Kamchatka Leaf Warbler Phylloscopus examinandus and Sakhalin Leaf Warbler P. borealoides to Thailand’s Avifauna.” It was published by the Japan Bird Banding Journal and is downloadable (708 KB) through shanghaibirding.com.

We record Kamchatka annually in Thailand, with most records in May. On average it is a later migrant than Arctic with (old specimen) records from Thailand and Malaysia even into the last days of May. Based on birds handled (and DNA assayed), I would re-emphasise that there is total overlap on the range of plumage characters with borealis.

Though we selected our first, unusually bright-plumaged “Arctic Warblers” in mid-May for assay specifically because they were a bit more yellow-green than usual, note that, just as in the panels above, some turned out to be examinandus and some seemingly identically bright birds were borealis.

Takema Saitoh at the Yamashina Institute has a little module that uses a canonical discriminant function that will separate most birds on biometrics. But of course, this is only good for birds that are handled. The key parameters are wing length, total head length (head plus bill), length of outermost primary, and length of tarsus.

As Craig Brelsford notes in his 6 June post, Kamchatka on average are a bit longer-billed. But even this did not reliably separate all birds unless one knew the sex (problems of overlap between female Kamchatka and male Arctic).

Call and song—so important!

Editor’s note: shanghaibirding.com has a growing library of resources on leaf warblers. In addition to the paper Phil Round directs us to above, we have the excellent presentation by Per Alström, “Identification of Phylloscopus & Seicercus warblers in China,” downloadable here (13 MB).

Craig Brelsford has written the following posts about leaf warblers:

Pale-legged Leaf Warbler & the Shanghai Big 5 (26 Sept. 2016)
Sakhalin & Pale-legged Leaf Warbler, Singing Together (5 May 2016)

For even more of our posts in which Phylloscopus is mentioned, type “leaf warbler” in the search box nearby.