Crested Goshawk Invades Shanghai

Crested Goshawk has sunk its talons into Shanghai. In the past year, records of the species have come from various locations throughout the city, in all four seasons. This past spring, a pair may have bred at Gongqing Forest Park.

It is remarkable that Crested Goshawk, a species of tropical and subtropical Asia, is even as far north as the Yangtze River. Most field guides show Accipiter trivirgatus indicus, the mainland form, occurring no farther north than Hangzhou. However, members of Shanghai Birding, the WeChat companion to this Web site, have reported Crested Goshawk in Nanjing and Nantong (Jiangsu). Other authorities record Crested Goshawk in Anhui, Henan, and even Beijing.

If the forest-loving goshawk has invaded the coastal, little-wooded, highly urbanized world of Shanghai, then it is not surprising that it would be using urban parks. Some of the parks of Shanghai, such as 102-year-old Zhongshan Park, where I found a pair of Crested Goshawk on 8 Sept., have massive trees and resemble old-growth forests.

Like the avifauna of islands, the birds of urban Shanghai’s green islands live in isolation. Except for stray cats and an occasional Siberian Weasel, urban residents Eurasian Tree Sparrow, Light-vented Bulbul, and Chinese Blackbird have few predators and are abundant.

With the imbalance comes an opportunity for raptors that can tolerate the noise and bustle of Earth’s Largest City. For Crested Goshawk, the pluses of urban living are apparently outweighing the minuses. It has come to feed on the rich store of passerines as well as mammals such as Pallas’s Squirrel.

On 16 May 2017 at Pudong’s Century Park, Shanghai Birding member Xueping Popp captured a Crested Goshawk exploiting the imbalance.

Crested Goshawk attacking Chinese Blackbird. Century Park, Shanghai, 17 May 2017. © 2017 by Stephan Popp & Xueping Popp
Crested Goshawk devouring Chinese Blackbird, Century Park, 17 May 2017. About this incident, photographer Xueping Popp wrote: ‘I went to Century Park early in the morning to look for Black Bittern. Nothing happened, so I decided to walk a little in the park. Suddenly I heard the cries of Chinese Blackbird. I looked up and saw a Crested Goshawk standing in the nest and eating a chick piece by piece. The scene was brutal, but Crested Goshawk was doing what raptors are supposed to do. I observed the whole process silently until the goshawk finished its meal.’ © 2017 by Stephan Popp & Xueping Popp.

Shanghai Birding member Wāng Jìn Róng (汪进荣) was one of the first birders to record Crested Goshawk in Shanghai. Jìn Róng has seen the species at Zhongshan Park and Gongqing Forest Park as well as on the grounds of the Shanghai Zoo. Jìn Róng took the photo at the top of this post as well as the photos immediately below. All were taken at Zhongshan Park–the photo above this past May, the photos below last December.

In December 2016 this Crested Goshawk made a very rare appearance in Zhongshan Park, Shanghai. Photo by Wāng Jìn Róng (汪进荣).
Crested Goshawk, Zhongshan Park, 18 Dec. 2016. Note the dark mesial stripe on white throat, heavy brownish to rufous streaking on the breast, and heavy rufous barring on the belly. The small nuchal crest is not seen here, being most obvious when the goshawk is in profile. (Wāng Jìn Róng).

The Crested Goshawk below, photographed by Shanghai Birding member Kai Pflug at Cape Nanhui, may have been in transit. Cape Nanhui has little tree cover beyond its famous microforests (where Kai got this photo), and Crested Goshawk is rarely recorded there.

Crested Goshawk, Cape Nanhui, April 2017. (Kai Pflug)
Crested Goshawk, Cape Nanhui, April 2017. Note large size but slim build and wings whose tips barely exceed the base of the tail. The short, rounded wings and long tail are adaptions to maneuvering through thick forest. (Kai Pflug)

Have you seen Crested Goshawk or other raptors in your city? Tell us your story in the comments below.

RESOURCES ON CRESTED GOSHAWK

Most field guides to Shanghai birds show outdated range maps for Accipiter trivirgatus indicus. Among them are Birds of East Asia (Brazil), A Field Guide to the Birds of China (MacKinnon & Phillipps), Handbook of the Birds of the World Vol. 2, and Raptors of the World (Ferguson-Lees & Christie).

The media below offer a clearer picture of the current status in China of Crested Goshawk.

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

Brelsford, Craig, moderator. Shanghai Birding, a WeChat group. The subject of Crested Goshawk generated discussions with various birders, among them Jiangsu birders Scoter and maidong, who had information about Crested Goshawk in Nanjing and Nantong. Hangzhou birder Cheng Qian reported on the distribution of Crested Goshawk in Zhejiang. Beijing-based member Paul Holt alerted us to scholarship on the changing distribution of Crested Goshawk and shared records of the species from Anhui and Beijing. Guangdong-based member Jonathan Martinez wrote about breeding Crested Goshawk in Hunan.

There are two ways to join Shanghai Birding. First, you need WeChat, the platform on which Shanghai Birding runs. Once you have installed WeChat, (1) fill out the form on our Sightings page or (2) friend Craig Brelsford on WeChat (ID: craigbrelsford). State that you wish to join the group.

eBird. 2017. eBird Range Map–Crested Goshawk. eBird: An online database of bird distribution and abundance [Web application]. eBird, Ithaca, New York. (Accessed: Sept. 14, 2017).

The eBird Range Map shows points on the Earth where checklists with Crested Goshawk have been submitted. The map shows Crested Goshawk in Zhejiang, Jiangsu, Anhui, and Henan as well as Shanghai.

Fei, Y.-L., Lei, M., Zhang, Y. and Lu, C.-H. Geographic Distribution Change of Crested Goshawk (Accipiter trivirgatus). Chinese Journal of Zoology 45 (2010): 174–175. Available here. (Accessed: Sept. 14, 2017).

Kamchatka Leaf Warbler in Shanghai

Seen at Pudong’s Cape Nanhui on Sun. 4 June 2017: Kamchatka Leaf Warbler Phylloscopus examinandus. Veteran British birder Michael Grunwell and I found our 4 Kamchatkas in Microforest 4 (30.953225, 121.959083), the largest of the tree plantations on the landward side of the sea wall. The species is an all-time first for the Shanghai eBird list.

Just after sunrise, Michael and I, as is our wont, were doing “drive-by birding”–creeping along the edge of the road, listening out for birds. Suddenly, I heard an unfamiliar sound.

My gut said, “Hard, loud–Taiga Flycatcher?”

Taiga was not even close, of course. Note, however, what my gut was not saying: “Arctic Warbler,” a bird whose call I know well. This call was decidedly not an Arctic’s, though it soon dawned on us that we were hearing some type of leaf warbler.

To see why my gut did not say Arctic, compare my recordings of the tight “tzit” call of Arctic Warbler with the looser call of Kamchatka Leaf Warbler:

Arctic Warbler Phylloscopus borealis, Yangkou-Rudong, Jiangsu (32.560095, 121.041956), 16 May 2015 (00:09; 1.9 MB)

Kamchatka Leaf Warbler P. examinandus, Microforest 4 (30.953225, 121.959083), Cape Nanhui, 4 June 2017 (00:25; 4.9 MB)

Michael and I skidded to a stop and poked our heads into the green tangle of locust trees. The call was being followed by a song. Only upon hearing the song did I think of Arctic Warbler. But here too, the song, though similar, was distinctive–wavier than the straight trill of Arctic. Look at the spectrograms below.

Spectrogram of Craig Brelsford's recording of Kamchatka Leaf Warbler Phylloscopus examinandus.

The spectrogram above is of my recording 4 June 2017 of Kamchatka Leaf Warbler. Note the pattern: downward sweeps followed by an upward sweep. No one would liken that song to an insect’s. Below, the spectrogram of my 2015 recording of the song of Arctic Warbler. Note the straight, cricket-like trill.

Spectrogram of Craig Brelsford's recording of Arctic Warbler Phylloscopus borealis.

Here are the recordings whose spectrograms are shown above:

Arctic Warbler, Yikesama National Forest, Hulunbeier, Inner Mongolia (52.150833, 121.465639), 16 July 2015 (01:00; 3.2 MB)

Kamchatka Leaf Warbler, Microforest 4, 4 June 2017 (00:48; 9.3 MB)

After hearing several song-call cycles, Michael, my more experienced partner and the man who has taught me more than anyone about birding, first said the words “Kamchatka Leaf Warbler.”

Michael has birded the Indonesian islands of Flores and Komodo, where Kamchatka Leaf Warbler winters. Michael said that, last winter, walking through the forests there, he heard dozens of times the call of P. examinandus.

“I know that call,” Michael said.

I whipped out my Olympus DM-650 voice recorder and recorded the calling and singing warbler. Meanwhile, we caught our first glimpse of the individual. It was clearly an “Arctic-type” leaf warbler.

What is an “Arctic-type” leaf warbler? An Arctic-type leaf warbler is a member of one of four closely related taxa divided among three species: Japanese Leaf Warbler Phylloscopus xanthodryas, Kamchatka Leaf Warbler P. examinandus, and Arctic Warbler P. borealis borealis and P. b. kennicotti.

Per's map of Arctic-type warblers.
Leaf-warbler expert and Shanghai Birding member Per Alström is the person most responsible for our current understanding of Arctic-type leaf warblers. Alström’s PDF, from which this page is taken, is a handy introduction to leaf warblers in China and is downloadable through shanghaibirding.com.

Arctic Warbler is by far the most widespread breeder in the complex. P. b. borealis breeds across northern Eurasia, from Scandinavia to northeast China and the Russian Far East. P. b. kennicotti breeds in western Alaska.

As their names suggest, Japanese Leaf Warbler breeds mainly in Japan (Honshu, Shikoku, Kyushu), Kamchatka Leaf Warbler mainly in the southern Kamchatka Peninsula (as well as on Hokkaido and Sakhalin and in the Kuril Islands).

In 2010 Shanghai Birding member Per Alström et al. proposed the current way of viewing the Arctic-type warblers. Previously, the taxon examinandus was putative, not even reaching the subspecies level; Alström and his team showed that examinandus, with its distinctive song and call, merits recognition not as a subspecies of Arctic Warbler but as a species in its own right.

Of the three Arctic-type species, Japanese Leaf Warbler most stands out, being on average yellower than the two others. Arctic and Kamchatka look much more alike.

There are, however, some slight differences. Kamchatka is said to have a “marginally longer bill, tarsi and tail” than Arctic (del Hoyo & Collar). Sure enough, the Kamchatka I photographed is long-billed. Take a look below.

Arctic Warbler (top) and Kamchatka Leaf Warbler. Both by Craig Brelsford.
Arctic Warbler (top) and Kamchatka Leaf Warbler. Both birds show the classic features of Arctic-type warblers, among them a long supercilium that does not reach bill base, a dark smudge on the lower mandible, and mottled ear coverts. Kamchatka is said to be slightly greener on average than Arctic, a description that these photos do not contradict. The bill of Kamchatka is also marginally longer than Arctic’s, and in these profile shots one notes the longer bill of the Kamchatka and the stouter bill of the Arctic. I would not suggest basing an Arctic-Kamchatka ID on plumage and bare parts. Plumage and bare parts can, however, enhance the quality of a song- or call-based ID. Top: South Lock (30.860073, 121.909997), Cape Nanhui, 13 May 2017. Bottom: Microforest 4 (30.953225, 121.959083), 4 June 2017. (Craig Brelsford)

Michael and I heard our loudest song and calls during that first, early morning encounter. However, we heard Kamchatka calling throughout the day.

Our new Shanghai record, combined with late-May and early-June records from nearby Zhejiang, suggests that in this region, once the wave of Arctics passes through around 15 May, Kamchatka Leaf Warbler may be the Arctic-type to look out for.

Bibliography

Alström P., T. Saitoh, D. Williams, I. Nishiumi, Y. Shigeta, K. Ueda, M. Irestedt, M. Björklund & U. Olsson. 2011. The Arctic Warbler Phylloscopus borealis — three anciently separated cryptic species revealed. Ibis 153:395-410.

Brelsford, C. 2017. eBird Checklist: http://ebird.org/ebird/view/checklist/S37369822. eBird: An online database of bird distribution and abundance [web application]. eBird, Ithaca, New York, USA. Available: http://www.ebird.org. (Accessed: June 6, 2017).

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

Brelsford, Craig, moderator. Shanghai Birding, a WeChat group. Discussions with various birders, chief among them Hangzhou birder Cheng Qian, who had information about sightings of P. examinandus in Zhejiang. Beijing-based Swedish birder Jan-Erik Nilsén also provided timely advice. To join Shanghai Birding, fill out the form on the shanghaibirding.com Sightings page. Please state that you wish to join Shanghai Birding. You may also friend Craig Brelsford (WeChat ID: craigbrelsford). In your friend request, please make it clear that you wish to join Shanghai Birding.

del Hoyo, J. & Collar, N. (2017). Kamchatka Leaf-warbler (Phylloscopus examinandus). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona, Spain. (retrieved from http://www.hbw.com/node/1343935 on 6 June 2017).

Jackett, N. 25 Feb. 2016. First Kamchatka Leaf Warbler recorded for Australian Mainland. eBird Australia: http://ebird.org/content/australia/news/first-recorded-kamchatka-leaf-warbler-for-australian-mainland/. eBird, Ithaca, New York, USA. Available: http://www.ebird.org. (Accessed: June 6, 2017).

Featured image: Kamchatka Leaf Warbler Phylloscopus examinandus. On 4 June 2017 at Cape Nanhui, birders Michael Grunwell and Craig Brelsford found the individual pictured here and three others. Photos by Craig Brelsford.