Comparing Richard’s and Blyth’s Pipit

Editor’s note: With more and more birders operating in Shanghai, more and more vagrant birds are bound to be discovered. One possibility is Blyth’s Pipit (photo above, L), a species similar to our familiar Richard’s Pipit (R). In this post, I will teach you how to separate the two.

2016 has been an outstanding birding year in Earth’s largest city. Paddyfield Warbler/Manchurian Reed Warbler, seen at Cape Nanhui on 18 Dec., was the latest in a parade of rare visitors seen in Shanghai in 2016. Our Sightings page has documented the discoveries.

The reason for the surge in good records, I am convinced, is more birders with better skills communicating more effectively. I am proud to say that shanghaibirding.com and the Shanghai Birding WeChat group have played a role.

In the Shanghai area, one species that has not yet been reported is Blyth’s Pipit. Anthus godlewskii breeds mainly in Mongolia, occurs on passage in central China, and winters mainly in India, so any records here would be of extralimitals. It is just the sort of vagrant that a bigger and better birding community could discover here in Shanghai.

Comparison of Richard's Pipit Anthus richardi "sinensis" (1) and Blyth's Pipit A. godlewskii (4). The putative taxon sinensis occurs in SE China S of the Yangtze and is the smallest population group within Richard's Pipit. Structurally it is similar to Blyth's Pipit. Note however the blackish centers to the median coverts (2, 3). In Richard's (2), the blackish centers are (a) diamond-shaped and (b) a bit fuzzy at the edges. In Blyth's (3), the blackish centers are squarish and more clearly defined. For years, Shanghai birders have been looking out for extralimital Blyth's Pipit. They are extremely rare or non-existent in the area. 1, 2: Nanhui, Shanghai, China, 15 Dec. 2016. 3, 4: Hulunbeier, Inner Mongolia, China, 22 July 2015. Craig Brelsford.
Comparison of adult-type Richard’s Pipit Anthus richardisinensis‘ (1) and adult Blyth’s Pipit A. godlewskii (4). The population group A. r. ‘sinensis’ occurs in southeast China south of the Yangtze River. Structurally, ‘sinensis‘ is the smallest group in Richard’s, with proportions recalling Blyth’s. Note however the blackish centers to the median coverts (2, 3). In adult-type Richard’s (2), the centers are triangular and tinged rufous at the edges. In adult Blyth’s (3), the centers are squarish, less rufous-tinged, and more clear-cut. 1, 2: Nanhui, 15 Dec. 2016. 3, 4: Hulunbeier, Inner Mongolia, 22 July 2015. Craig Brelsford.

The key to getting a Blyth’s in Shanghai is paying attention to the many Richard’s Pipit that we see in the area. Anthus richardi is more or less a passage migrant in the Shanghai area and is recorded here regularly in spring and autumn. Some are present in winter; Elaine Du and I had a “sinensis” last week, the ID’ing of which led to this post.

More views of Blyth's Pipit performing flight song. Alström writes that in flight, Blyth's Pipit 'often recalls one of the smaller pipits rather than Richard's' (237). 22 July 2015, Hulunbeier. Craig Brelsford.
More views of Blyth’s Pipit performing flight song, Inner Mongolia, July 2015. In Pipits and Wagtails, Shanghai Birding member Per Alström et al. write that in flight, Blyth’s Pipit ‘often recalls one of the smaller pipits rather than Richard’s’ (237). Note however that Anthus richardi ‘sinensis,’ a population group within Richard’s Pipit often found in Shanghai, is structurally similar to Blyth’s. Craig Brelsford.

Richard’s “sinensis” is very similar to Blyth’s, being best told by song, which is rarely heard in the Shanghai area. According to Per Alström et al., whose book Pipits and Wagtails is the authority on Palearctic and Nearctic pipits, the song of Blyth’s is “very characteristic and completely different from [that] of Richard’s” (242). During a trip in July 2015 to the Inner Mongolian prefecture of Hulunbeier, one of the few places in China where Blyth’s breeds, I recorded the song.

Blyth’s Pipit, flight song, recorded 22 July 2015 at a point (48.767866, 116.834183) near Hulun Lake, Inner Mongolia (2.1 MB; 00:32)

The calls of the two species also differ, but less markedly. The flight call of Richard’s is a common bird sound in Shanghai during migration season. The call of Blyth’s is similar enough to “cause problems even for some veteran observers” (Alström et al. 244). For Shanghai birders, even those unfamiliar with Blyth’s, a “Richard’s” with a strange flight call is worth your attention. Listen for what Alström et al. describe as a call “less harsh, softer and more nasal” than Richard’s (244). For reference, review the flight call of Richard’s:

Richard’s Pipit, flight call, Dishui Lake, Shanghai, 5 Feb. 2016 (00:01; 852 KB)

Regarding plumage, the most reliable differentiator of Richard’s and Blyth’s is the pattern of the median coverts. In Blyth’s, a typical adult-type median covert will show well-defined, squarish black centers. In Richard’s, the adult-type median coverts are less clear-cut, rufous-tinged, and triangular. Note that the fresher the plumage, the more reliable this differentiator is.

Another less reliable criterion is structure. Shanghai birders will agree that the first impression a non-“sinensis” Richard’s usually gives is “large pipit.” Other pipits, such as Buff-bellied Pipit, Red-throated Pipit, and Olive-backed Pipit, give a “small pipit” impression.

Richard's Pipit, Yangkou, Jiangsu, 5 Sept. 2014. Alström et al. urge birders to use care in ID'ing Blyth's and Richard's. Here, the median coverts of this Richard's appear squarish, like Blyth's (bottom R, inset). But note the date of the photo: 5 Sept., a time of year when most Richard's show worn plumage. The authors write: 'In worn plumage the shape of the dark centres to the secondary coverts is generally less obviously different, and the pale tips can be much the same colour in both species' (237). The ID of this Richard's was derived from its call, a more constant feature, and not from the appearance of its worn median coverts. Craig Brelsford.
Richard’s Pipit, Yangkou, Jiangsu, 5 Sept. 2014. Alström et al. urge care in ID’ing Blyth’s and Richard’s. Here, the median coverts of this Richard’s appear squarish, like Blyth’s (bottom R, inset). But note the date of the photo: 5 Sept., a time of year when most Richard’s show worn plumage. ‘In worn plumage,’ the authors write, ‘the shape of the dark centres to the secondary coverts is generally less obviously different, and the pale tips can be much the same colour in both species’ (237). The ID of this Richard’s was derived from its call, a more constant characteristic, and not from the appearance of its median coverts, a more variable characteristic. Craig Brelsford.

Alström et al. say, and I having seen Blyth’s can concur, that a birder viewing Blyth’s will get a “small pipit” impression: “The smaller size, lighter build and shorter tail,” the authors write, “are often most apparent in flight, when [Blyth’s] often recalls one of the smaller pipits rather than Richard’s.” Note also that the smaller size and shorter bill, tail, and hind claw of Blyth’s give that species a “better proportioned” look than the larger and heavier Richard’s (237).

The directions above should be seen as guidelines; individual Richard’s and Blyth’s may defy easy categorization, “sinensis” Richard’s even more so. Alström et al. caution against jumping the gun with your ID: “It is crucial to realise that in both species (especially Richard’s) appearance can vary considerably in one and the same individual depending on mood, weather, etc.,” they write. “Also, some Richard’s are structurally very like Blyth’s; this is especially true of southern Chinese Richard’s (‘sinensis’)” (237).

A record of Blyth’s Pipit in Shanghai would shoot to the top of the “Year’s Best” list. The stakes are high, so look diligently, and use caution. Good luck!

PADDYFIELD WARBLER/MANCHURIAN REED WARBLER

This Acrocephalus warbler was found at the Magic Parking Lot at Nanhui on 18 Dec. 2016. Photo by Komatsu Yasuhiko.
This acrocephalid warbler, most likely Paddyfield Warbler Acrocephalus agricola or Manchurian Reed Warbler A. tangorum, was found at the Magic Parking Lot at Nanhui on 18 Dec. 2016 by Andy Lee, Komatsu Yasuhiko, Larry Chen, and Archie Jiang. Photos by Komatsu Yasuhiko.

On 18 Dec. 2016, a quartet of teenage birders found an acrocephalid in the Magic Parking Lot at Cape Nanhui. The photos by Komatsu Yasuhiko provoked discussion on the WeChat group Shanghai Birding. The consensus is that the bird is either Paddyfield Warbler Acrocephalus agricola or Manchurian Reed Warbler A. tangorum.

In the images above, note the supercilium, which extends behind the eye; dark eye-line; bright white chin and throat; peach breast band and flanks; bill with black upper mandible and pink lower mandible; and peaked head. Those criteria most closely indicate Manchurian Reed Warbler and Paddyfield Warbler.

Paddyfield Warbler winters mainly in India and would be extralimital here; Manchurian Reed Warbler breeds in northeastern China, is listed as Vulnerable and is therefore scarce, and probably passes through Shanghai.

Congratulations to Andy Lee, Komatsu Yasuhiko, Larry Chen, and Archie Jiang for this great Shanghai record.

INTERVIEW WITH PUDONG TV

On Thurs. 15 Dec. at Cape Nanhui my wife Elaine Du and I did an interview with Pudong TV in Chinese. The segment will last five minutes and be aired later this month. (UPDATE, 24 DEC 2016: Segment available here.) In the interview I lamented the losses at Nanhui and spoke glowingly of the possibilities.

Meanwhile, John MacKinnon, co-author of the most famous bird guide in the history of China and author of a recent post for shanghaibirding.com, has expressed interest in the establishment of an easily accessible, world-class wetland reserve at Cape Nanhui.

MacKinnon asked me for the reasoning behind a wetland reserve at Cape Nanhui. I wrote the following:

THE CASE FOR AN EASILY ACCESSIBLE, WORLD-CLASS WETLAND RESERVE AT CAPE NANHUI, PUDONG, SHANGHAI

I created four images to bolster the case for a wetland reserve at Cape Nanhui. Here is the first. Satellite map © Google and customized by Craig Brelsford.
I created four images to bolster the case for a wetland reserve at Cape Nanhui. Here is the first. Satellite image © 2016 Google. Customized by Craig Brelsford.

(1) Cape Nanhui is of extraordinary environmental importance. The tip of the Shanghai Peninsula between the Yangtze River and Hangzhou Bay, Cape Nanhui is a stepping stone for birds migrating across those bodies of water. Cape Nanhui also holds large reed beds, habitat critical to Reed Parrotbill, Marsh Grassbird, and other species at risk.

The largest component of the city-province of Shanghai is the Shanghai Peninsula, a projection of land between the Yangtze River and Hangzhou Bay. Cape Nanhui is the tip of the peninsula, is a critically important stop for migrating birds, and is completely unprotected. A nature reserve at Cape Nanhui would form a third stepping stone for birds crossing the mouth of the Yangtze, joining the reserves at Chongming Dongtan and Jiuduansha.

The Red Sector encompasses the defunct wetland reserve at Cape Nanhui. Despite being completely unmanaged and unprotected, the site still attracts many important migratory birds, among them Black-faced Spoonbill. Satellite map © Google and customized by Craig Brelsford.
The Red Sector encompasses the defunct wetland reserve at Cape Nanhui. Despite being completely unmanaged and unprotected, the site still attracts many important migratory birds, among them Black-faced Spoonbill. Satellite image © 2016 Google. Customized by Craig Brelsford.

The 2 Red-crowned Crane seen on Sat. 10 Dec. 2016 were the latest in a parade of endangered birds that I and other birders have noted at the Cape over the years. Critically Endangered Spoon-billed Sandpiper uses Cape Nanhui, as does Endangered Nordmann’s Greenshank. Around 2 percent of the world’s Endangered Black-faced Spoonbill are dependent on Cape Nanhui for several months each year. Large reed beds remain at Cape Nanhui and are the final strongholds on the Shanghai Peninsula of Near Threatened Marsh Grassbird and Near Threatened Reed Parrotbill. The latter species, a candidate for Shanghai Provincial Bird, will virtually disappear from mainland Shanghai if the reed beds at Nanhui are destroyed.

(2) Shanghai is clearly under-performing on the conservationist front. More must be done, and a good place to begin is Cape Nanhui.

Marsh Grassbird still sing in the Yellow Sector. Satellite map © Google and customized by Craig Brelsford.
Marsh Grassbird still sing in the Yellow Sector. Satellite image © 2016 Google. Customized by Craig Brelsford.

Nature reserves have been established only on the extreme fringes of the city-province (which is a third the size of Wales). There are no reserves in mainland Pudong, a giant coastal district nearly twice the size of Singapore. Nowhere in this megalopolis can residents without a car enjoy the natural side of Shanghai, a city with an extraordinarily rich natural heritage. There is no known plan to conserve any of the dozens of square kilometers of reclaimed land on Hengsha.

(3) Because it is in the back yard of Shanghai, a city-province of more than 25 million people, a well-run, easily accessible wetland reserve at Cape Nanhui could be the match to light the fire of conservation across all China.

Hundreds of thousands of middle-class children could visit the reserve with their parents using nothing more than the Metro and a quick taxi ride and be sleeping in their own bed that night, dreaming about the wild birds they had seen that day. For millions of parents and their kids, the weekend could be “Saturday, Disney; Sunday, Cape Nanhui Wetland.” A day at a Cape Nanhui Wetland would be an early introduction to the glories of natural Shanghai and would foster an appreciation of the natural world.

Fourth of four images showing the possible ways of preserving Cape Nanhui. Satellite map © Google and customized by Craig Brelsford.
Continued land reclamation could spell trouble at Nanhui. Satellite image © 2016 Google. Customized by Craig Brelsford.

If Shanghai can be a world economic center and have world-class airports and a world-class skyline and world-class entertainment such as Disney, then it can and must have an easily accessible, world-class reserve protecting its priceless coastline, reed beds, and migratory birds.

A world-class, easily accessible, wetland nature reserve at Cape Nanhui would become a mecca for birders and achieve world renown, as has been the case with similar reserves such as Mai Po at Hong Kong and Sungei Buloh in Singapore.

INDEX TO POSTS ON SAVING NANHUI

Messengers (recent records of endangered cranes in Shanghai show the need to protect more land in the city-province)
The Case for Conserving Nanhui (foreigners can’t do all the work; local Chinese need to step up, too)
Save the Nanhui Wetland Reserve! (cri de coeur plus call to action)
Remnants (preparation for probable demise of Cape Nanhui)
Reed Parrotbill, Symbol of Shanghai (naming Reed Parrotbill Provincial Bird of Shanghai will send a message about the importance of the reed beds such as those at Cape Nanhui)
Spoon-billed Sandpiper at Nanhui (proof of yet another endangered species using the defunct wetland reserve at Nanhui)

The Day Lists
Lists are generated on eBird then adjusted to comport with my first reference, the IOC World Bird List.

List 1 of 1 for Thurs. 15 Dec. 2016 (53 species)

Lumbering flight of Eurasian Bittern. Nanhui, Pudong, Shanghai, 15 Dec. 2016. (Craig Brelsford)
Lumbering flight of Eurasian Bittern. Nanhui, Pudong, Shanghai, 15 Dec. 2016. (Craig Brelsford)

Birds noted around Pudong Nanhui Dongtan Wetland (Pǔdōng Nánhuì Dōngtān Shīdì [浦东南汇东滩湿地]; 30.920507, 121.973159), Pudong, Shanghai, China. We covered the coastal road from Binhai (Bīnhǎi Zhèn [滨海镇]; 31.006250, 121.885558) to Luchao (Lúcháo Gǎng [芦潮港]; 30.851109, 121.848455). Among the points along this 30 km stretch are Iron Track (31.003613, 121.907883), a site providing access to the reed beds at the mouth of the Dazhi River (Dàzhì Hé [大治河]); Big Bend (31.000321, 121.938074); Microforest 4 (30.953225, 121.959083); Microforest 1 (30.923889, 121.971635); Magic Parking Lot (30.884898, 121.968229); Magic GPS Point (30.880563, 121.964551); South Lock (30.860073, 121.909997); Eiffel Tower (30.850531, 121.878047); & the Marshy Agricultural Land (30.850707, 121.863662). List includes birds noted at Dishui Lake (30.908702, 121.945124). Sunny, breezy. Low 2° C, high 7° C. Humidity 66%. Visibility: 10 km. Wind NW 18 km/h. PM2.5 AQI: 160 (unhealthful). Sunrise 06:46, sunset 16:54. SAT 03 DEC 2016 08:20-17:00. Craig Brelsford & Elaine Du.

Tundra Bean Goose Anser serrirostris 20
Tundra Swan Cygnus columbianus bewickii 19
Common Shelduck Tadorna tadorna 550
Falcated Duck Anas falcata 400
Mallard A. platyrhynchos 80
Eastern Spot-billed Duck A. zonorhyncha 250
Northern Shoveler A. clypeata 300
Northern Pintail A. acuta 120
Eurasian Teal A. crecca 40
Tufted Duck Aythya fuligula 10
Greater Scaup A. marila 3
Common Pheasant Phasianus colchicus 2
Little Grebe Tachybaptus ruficollis 40
Great Crested Grebe Podiceps cristatus 2
Black-necked Grebe P. nigricollis 7
Great Cormorant Phalacrocorax carbo 80
Eurasian Bittern Botaurus stellaris 1
Grey Heron Ardea cinerea 60
Great Egret A. alba 8
Little Egret Egretta garzetta 50
Black-crowned Night Heron Nycticorax nycticorax 7
Eurasian Spoonbill Platalea leucorodia 72
Western Osprey Pandion haliaetus 1
Eastern Marsh Harrier Circus spilonotus 1
Eurasian Coot Fulica atra 50
Hooded Crane Grus monacha 1
Grey Plover Pluvialis squatarola 8
Kentish Plover Charadrius alexandrinus 30
Eurasian Curlew Numenius arquata 1
Dunlin Calidris alpina 70
Spotted Redshank Tringa erythropus 22
Common Greenshank T. nebularia 1
Vega Gull Larus vegae vegae/L. v. mongolicus 21
Spotted Dove Streptopelia chinensis 8
Eurasian Hoopoe Upupa epops 1
Peregrine Falcon Falco peregrinus 1
Long-tailed Shrike Lanius schach 10
Chinese Penduline Tit Remiz consobrinus 20
Light-vented Bulbul Pycnonotus sinensis 7
Dusky Warbler Phylloscopus fuscatus 1
Plain Prinia Prinia inornata 1
Vinous-throated Parrotbill Sinosuthora webbiana 10
Crested Myna Acridotheres cristatellus 50
Pale Thrush Turdus pallidus 2
Dusky Thrush T. eunomus 3
Daurian Redstart Phoenicurus auroreus 3
Eurasian Tree Sparrow Passer montanus 50
White Wagtail Motacilla alba 6
Richard’s Pipit Anthus richardi 1
Buff-bellied Pipit A. rubescens japonicus 15
Chestnut-eared Bunting Emberiza fucata 7
Little Bunting E. pusilla 1
Pallas’s Reed Bunting E. pallasi 1

WORKS CONSULTED

Alström, Per, Krister Mild & Bill Zetterström. Pipits and Wagtails. Princeton University Press, 2003. This landmark book, co-authored by Shanghai Birding member Per Alström, is my first reference on all things Motacillidae.

Join Shanghai Birding for the very latest bird sightings in Shanghai.
For the latest bird sightings in Shanghai, join Shanghai Birding!

Brazil, Mark. Birds of East Asia. Princeton University Press, 2009. Serviceable descriptions of Blyth’s Pipit and Richard’s Pipit. Illustration of “sinensis.” Good coverage of Paddyfield Warbler, Manchurian Reed Warbler.

Brelsford, Craig, moderator. Shanghai Birding, a WeChat chat group. Pipits and reed warblers discussed in detail. To join Shanghai Birding, fill out the form on our Sightings page.

Kennerley, Peter & David Pearson. Reed and Bush Warblers. Christopher Helm, 2010. The world standard on Acrocephalidae, Cettiidae, and Locustellidae.

Svensson, Lars & Killian Mullarney & Dan Zetterström. Collins Bird Guide, 2nd ed. HarperCollins, 1999-2009. Outstanding illustrations of Richard’s Pipit and Blyth’s Pipit by Mullarney.

 

Save the Nanhui Wetland Reserve!

Editor’s note: The photo leading off this post shows an abandoned sign introducing Ruddy Turnstone that has been turned into a wall of a shack in the abandoned nature reserve at Nanhui. On 29 Oct. 2016 in the marshy land just behind the sign were 54 Endangered Black-faced Spoonbill, an Endangered Nordmann’s Greenshank, a Near Threatened Red Knot, 2 Vulnerable Saunders’s Gull, and a score of other species. In the essay below, I argue that the defunct nature reserve at Nanhui should be brought back to life and converted into a world-class wetland, like Sungei Buloh in Singapore. — Craig Brelsford

I like to extol the city in which I have spent the past nine years. I like to tell people about the green side of Shanghai, the city at the mouth of Asia’s greatest river and on Earth’s greatest migratory flyway. How exciting it is to bird in Earth’s largest city.

I see in Shanghai an opportunity to show the rest of China how to cherish its natural heritage. The people of Shanghai can teach China and the world to view nature as an asset. They can do this by creating an easily accessible wetland reserve at Nanhui.

Shanghai already is an environmental leader, in a way. My wife Elaine Du and I have toured the 330 km (205 mi.) stretch of coast from Nanhui to Yancheng in Jiangsu. Remaining mudflats and wetlands are very few–and some of the best are not those found in the less-populated areas but those found in the megalopolis of Shanghai. Eastern Chongming Island enjoys considerable protection, and there is Jiuduansha (31.166667, 121.925000), intertidal wetland shoals in the sea near Pudong Airport.

Birds of the defunct nature reserve at Nanhui, 29 Oct. 2016. Panel 1: Nordmann's Greenshank. 2: Black-faced Spoonbill. 3a-3d: Saunders's Gull. 4: Ruff. Photos by Craig Brelsford and Elaine Du.
Birds of the defunct wetland reserve at Nanhui, 29 Oct. 2016. Panel 1: Nordmann’s Greenshank Tringa guttifer. 2: Black-faced Spoonbill Platalea minor. 3a-3d: Saunders’s Gull Chroicocephalus saundersi. 4: Ruff Calidris pugnax. Photos in panels 1, 3d, and 4 by Elaine Du. Others by Craig Brelsford.

The problem with Jiuduansha especially and to a lesser extent Chongming Dongtan is that they are not easily accessible. The next step for Shanghai is a nature reserve easily accessed by the people, along the lines of the Mai Po Marshes in Hong Kong and Sungei Buloh in Singapore.

It is amazing to me that such a reserve was not in the master plans for Pudong when the New Area was conceived. Pudong is big–it covers 1210 sq. km (467 sq. mi.), nearly twice the size of Singapore. Within this New Area you have the world-class urban architecture and business districts around Lujiazui, you now have world-class family entertainment at the Shanghai Disney Resort–and you have world-class wildlife, the natural inheritance of the city, waiting on the coast, ready to be preserved, experienced, and loved. There is moreover the example of other Asian megacities such as the aforementioned two that found room for wildlife–and that wear their urban reserves as a badge of civic pride.

INCONGRUOUS: Sign from transformed wetland reserve still stands, despite drainage and planting of hundreds of trees in area where Black-winged Stilt once foraged.
In Nanhui’s defunct wetland reserve, the south side of the access road has already been transformed, as this scene shows. Where Black-winged Stilt once foraged, a tree plantation now stands. The area was dredged and drained earlier this year. Barring a miracle, a similar fate awaits the north side. For more on the earlier stage of the destruction of Nanhui, see my 27 March 2016 post, Amid the Din of the Diggers. (Archive photo: Craig Brelsford)

Mai Po and Sungei Buloh are easily reachable by bus. In Shanghai, the Metro already reaches Lingang New City, and a cheap, fast taxi ride gets you from Dishui Lake Station to Nanhui’s abandoned wetland reserve 8 km away (at 30.920507, 121.973159). The infrastructure for an accessible “people’s nature reserve” is in place, and the birds are there at Nanhui, crying out for real, lasting protection.

Sungei Buloh is a particularly good example for Pudong, as Sungei Buloh is about the same size (1.3 sq. km) as the defunct nature reserve at Nanhui (1.2 sq. km). Like Nanhui’s defunct reserve, Sungei Buloh was not originally considered a likely place for a nature reserve. Sungei Buloh was willed into being by the actions of local nature lovers who understood the value of the site. Likewise, a change of heart and an act of will can bring the abandoned reserve at Nanhui back from the brink.

Black-faced Spoonbill, defunct wetland, Nanhui, 29 Oct. 2016. Photo by Craig Brelsford.
Black-faced Spoonbill, defunct nature reserve, Nanhui, Sat. 29 Oct. 2016. Every year from September to March this endangered species is highly reliant on the abandoned reserve. A recent study estimated the number of Black-faced Spoonbill in the world to be about 2700. Last Saturday we counted 54 at the defunct reserve–2 percent of the world’s population. On Saturday most of the spoonbills were at their accustomed roost (30.922647, 121.966632). If developers have their way, then the roost and the entire wetland site will be transformed, the spoonbills and other species will be pushed out, and future nature lovers in Shanghai will effectively be denied the chance to appreciate this East Asian endemic. (Craig Brelsford)

The sight of Nanhui’s defunct reserve, which apparently just missed being dredged and drained this year, and which could well be torn up next year, saddens me–not just because of the endangered Black-faced Spoonbill that so obviously rely on the place, and not only for the endangered Nordmann’s Greenshank that has been living there–but also for the grandchildren of the people currently making the decisions, who may have these treasures denied them, and who may fail to appreciate the natural heritage of this great city.

The development plans for Pudong in general and Nanhui and Lingang New City in particular need to have a major component dedicated to conservation. Jiuduansha is simply not enough for Pudong. Those mud banks, barely above sea level, are a place for researchers, not the public. To meet the standard set by other coastal megacities, Pudong needs an easily accessible nature reserve on its mainland. That defunct nature reserve is just the place.

Black-faced Spoonbill and Eurasian Spoonbill, defunct nature reserve, Nanhui, 29 Oct. 2016.
Black-faced Spoonbill and Eurasian Spoonbill, defunct nature reserve, Nanhui, 29 Oct. 2016. Photo shows 19 of the 54 Black-faced Spoonbill we counted that day as well as 5 Eurasian Spoonbill. The latter species ranges across Eurasia. The former is one of the rarest birds in Asia–and Shanghai is one of its few remaining strongholds. (Craig Brelsford)

I think some local people realize the dire situation at Nanhui, and I understand that local birders had much to do with the one-year stay of execution granted the abandoned nature reserve. Those birders deserve everyone’s thanks.

I think I speak for many foreigners when I say to my Shanghai conservationist friends: If you need our support, then we will give it to you. Ideas, a pat on the back, anything–we’re here. 加油!

The Shanghai Skua

Found at Nanhui on Wed. 19 Oct. 2016: Pomarine Skua (called Pomarine Jaeger in North America and by the IOC). This first record for Shanghai was discovered by local birder Hé Xīn (何鑫) in the defunct nature reserve 1.4 km inland from the East China Sea. Kai Pflug was also on hand. Hé Xīn and Kai spread the news through our Shanghai Birding WeChat group, and the next day Elaine Du and I found the skua at the same spot (30.921625, 121.958940). The skua stayed four days, until Sat. 22 Oct.

The seabird appeared healthy, alternately feeding, preening, and roosting. Its plumage was shiny, and I saw no evidence of injury. It was a healthy refugee blown west by Typhoon Haima.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
Look into the eyes of a predator. For many a lemming on the Arctic breeding grounds, this cold stare is the last sight they will ever see. National Geographic calls Pomarine Skua a ‘bulky brute with a commanding presence … a Rottweiler among the jaegers.’ (Photo by Craig Brelsford.)

As sightings of skuas on the Chinese coast are rare, and because skuas have a bewildering array of plumages, at first there was some confusion about the species of our bird. It soon became clear that the vagrant was either Pomarine Skua Stercorarius pomarinus or Arctic Skua (IOC: Parasitic Jaeger) S. parasiticus. But which?

POMARINE ID BASICS

To answer that question, we needed photos, and so on Thurs. 20 Oct. Elaine and I drove to Nanhui, the coastal birding site in Pudong.

We quickly found and photographed the bird. After examining our images, talking to other birders, and studying the books, we determined that it is a pale-morph adult pomarinus in non-breeding plumage. Here’s why:

— S. pomarinus is larger and bulkier than the other jaegers (small skuas), in particular the jaeger that it most resembles, S. parasiticus. The jaeger we found was large and bulky.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
Pomarine Skua Stercorarius pomarinus. This heavy-set jaeger appears bulkier before the legs than behind. Note its bull neck, barrel chest, and short tail. Size is about equal to Black-tailed Gull Larus crassirostris (Brazil). S. parasiticus is equally bulky before and behind the legs, is longer-necked and less pot-bellied, and has a longer tail. (Craig Brelsford)

National Geographic describes pomarinus as a “bulky brute with a commanding presence [and a] thick bull-neck–a Rottweiler among the jaegers.” S. pomarinus, Geographic adds, “is the bulkiest [jaeger] and appears pot-bellied and very deep at the chest. … Often it appears there is more body before the wing than behind the wing.”

The image above is in line with that description. Below, another image illustrating the bulky shape and barrel chest.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
The skua family (Stercorariidae) is monogeneric; all seven species are in the genus Stercorarius. In the United States and Canada, the smallest three Stercorarius are called jaegers, a convention followed by the IOC. The largest of the jaegers is Pomarine, the next-largest is Arctic Skua/Parasitic Jaeger, and the smallest is Long-tailed Skua/Long-tailed Jaeger S. longicaudus. All three jaegers breed on Arctic tundra in Eurasia and North America and winter at sea. All are kleptoparasitic–they steal food from other birds. This habit gives rise to the Chinese name for the family: ‘thief-gull’ (贼鸥). (Craig Brelsford)

In adult pale-morph pomarinus, the black helmet reaches below the gape, and black plumage surrounds the base of the bill. Most pale-morph parasiticus show a white spot at the base of the upper mandible and a less-extensive helmet that does not reach below the gape.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
The Shanghai pomarinus is a pale-morph adult in non-breeding plumage. (Traces of the yellow breeding plumage can be seen here on the cheeks and throat.) Its helmet reaches below the gape, and it lacks a pale spot at the base of the upper mandible. (Craig Brelsford)

Below, another close-up of the head. Note here and above that, unusually for pomarinus, the bill appears almost all-black.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
The Shanghai pomarinus has an unusually dark bill. (Craig Brelsford)

Adult pale-morph pomarinus is more heavily barred than parasiticus. Most adult pale-morph pomarinus show a coarse breast band and dark barring on the flanks. Most adult pale-morph parasiticus show a diffuse greyish-brown breast band and lack barring on the flanks.

skua-pomarine008
Our pomarinus shows broad, coarse barring across the breast and on the flanks. (Craig Brelsford)

There are several other ID points, some of them, such as tail streamers, not visible in The Shanghai Skua. The points discussed above, however, are enough, we think, to clinch the ID.

OTHER PHOTOS

Enjoy these other photos of the rarity.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
When Elaine and I arrived Thursday morning, a Grey Heron was harassing the strange intruder. (Craig Brelsford)

The skua was very tame and performed various functions in its unaccustomed surroundings. It scratched itself (below), bathed, scavenged dead fish, and occasionally took short flights.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
Photo by Craig Brelsford

Its most common activity was roosting on the mud bank.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 20 Oct. 2016.
Photo by Craig Brelsford

Kai Pflug got the photo below of the skua with wings upraised. Note the unbarred underwing and pale flash at the base of the primaries, further evidence that the skua is an adult.

Pomarine Skua/Pomarine Jaeger Stercorarius pomarinus, Nanhui, Shanghai, 19 Oct. 2016. Photo by Kai Pflug.
Photo taken 19 Oct. 2016 by Kai Pflug.
Compare the images of our non-breeding Pomarine with this shot of an individual in breeding plumage. Photo taken by Daniel Pettersson in Alaska in June 2016.
Compare the images of our non-breeding Pomarine with this shot of an individual in breeding plumage. Photo taken by Daniel Pettersson in Alaska in June 2016.

Hé Xīn (below) found The Shanghai Skua on Wed. 19 Oct. 2016, a historic first record for Shanghai. The next day I met Hé Xīn at the site.

Craig Brelsford (L) and Hé Xīn (何鑫), Nanhui, 20 Oct. 2016. Photo by Elaine Du.
shanghaibirding.com editor Craig Brelsford (L) and Shanghai Skua discoverer Hé Xīn (何鑫), Nanhui, 20 Oct. 2016. (Elaine Du)

RARE AUTUMN RECORD OF NARCISSUS FLYCATCHER

On Thurs. 20 Oct. and Sun. 23 Oct. 2016, Elaine Du and I birded Nanhui and the sod farm south of Pudong Airport (31.112586, 121.824742). On 23 Oct. Elaine and I were joined by British birder Michael Grunwell. The two days yielded 92 species. After the Pomarine Jaeger, the big news was rare autumn sightings of Narcissus Flycatcher, another record of Nordmann’s Greenshank, and still more evidence that the highly threatened Nanhui wetland is much depended on by Black-faced Spoonbill.

Siberian Thrush, Nanhui, 23 Oct. 2016.
Siberian Thrush is a very shy bird. I have noted Geokichla sibirica in Heilongjiang, its breeding grounds, and even in breeding season the bird is hard to see. In these photos, however, taken Sun. 23 Oct. 2016 at Nanhui, this female Siberian Thrush is conspicuous. Why? Hunger. The migrant is exhausted and must feed. In the top panel, the thrush checks on me, then, almost in spite of itself, it attacks the leaf litter (middle panel). In the bottom panel, we see that the thrush has come up short; only a speck of leaf is in its bill. The thrush spent hours in Microforest 4 (30.953225, 121.959083), recharging after the long flight south. Despite their tiny size, the microforests of Nanhui provide forest habitat critical to woodland species such as Siberian Thrush. (Craig Brelsford)

On 20 Oct. in the canal at the base of the sea wall at Nanhui, Elaine and I had 18 Mandarin Duck and 2 season’s first Greater Scaup. On 23 Oct., the Nanhui microforests yielded Eurasian Woodcock, Ashy Minivet, Siberian Thrush, Red-throated Thrush, and season’s first Pale Thrush. A male Siberian Rubythroat popped out of the undergrowth and a Northern Boobook dozed before a crowd of photographers. At the line of trees (30.859995, 121.910061) near South Lock, 6 km south of the Magic Parking Lot (30.882688, 121.972489), we had season’s first Tristram’s Bunting. Dishui Lake (30.908702, 121.945124) is attracting ducks again, the most notable Sunday being season’s first Tufted Duck and Common Pochard.

Northern Boobook, one of four we saw on 23 Oct. 2016 at Nanhui.
Northern Boobook, one of four we saw 23 Oct. 2016 at Nanhui. (Craig Brelsford)

The sod farm, which we visited Sunday morning, and which lies just off the S32 freeway, was worth the small investment of time required to get there. The grassy area gave us an unusually large (80) group of Red-throated Pipit. In Nanhui, we have been experiencing this species only in fly-by mode, but at the farm dozens of them were feeding on the ground. Michael and I studied the pipits carefully and concluded the group was pure Red-throated; we saw not a single Buff-bellied Pipit.

Ducks are once again gracing the canals and ponds of Nanhui. The most numerous were, as expected, Eastern Spot-billed Duck (285 over the two days) and Eurasian Teal (270 on 23 Oct.). Less numerous was Eurasian Wigeon, and there were sprinklings of Gadwall, Mallard, Northern Shoveler, Northern Pintail, and Garganey.

OTHER NOTES

Narcissus Flycatcher, Nanhui, 23 Oct. 2016.
Narcissus Flycatcher, male (top left) and three females, Nanhui, 23 Oct. 2016. Every year between about 15 April and 15 May, Narcissus Flycatcher passes through the Shanghai region. It is fairly common during that time but rarely recorded in autumn. One of the most beautiful of Asia’s colorful flycatchers, Ficedula narcissina breeds in Japan and on Sakhalin and the adjacent Russian mainland. It winters in Borneo. (Craig Brelsford)

— Uniquely among the Shanghai region’s passage-migrant flycatchers, most of which appear in roughly equal numbers on both the spring and autumn migrations, Narcissus Flycatcher appears almost exclusively on the spring migration. We were therefore pleasantly surprised Sunday to see the three males and three females. Did Typhoon Haima send them our way? What are the migration patterns of this beautiful flycatcher?

Pink-billed juvenile Black-faced Spoonbill feeds in the defunct nature reserve at Nanhui, 23 Oct. 2016.
Pink-billed sub-adult Black-faced Spoonbill feeds in Nanhui’s defunct nature reserve (30.920507, 121.973159), 23 Oct. 2016. The spoonbill was surprisingly close to the road, driven there by lack of habitat. Despite the disadvantages of the site, the abandoned reserve remains one of the most hospitable places on the Shanghai coast for spoonbills and many other species. (Craig Brelsford)

— The importance of the Nanhui wetlands–as well as the dangers they face–can hardly be overstated. On 20 Oct. at the skua site, Hé Xīn told me that the defunct wetland in which we were standing would already have been utterly transformed by now had it not been for the intervention of Chinese birders, who secured a one-year delay. Within a radius of a few hundred meters of the skua site stood 24 endangered Black-faced Spoonbill and an endangered Nordmann’s Greenshank. The dependence of Black-faced Spoonbill on the defunct wetland reserve is obvious and could be demonstrated by a group of high-schoolers doing a science project. Shanghai lies at the mouth of one of Earth’s greatest waterways (the Yangtze River) and is a major point on Earth’s greatest migratory flyway–yet this wealthy city, a world financial center with a rich natural heritage, entirely lacks an easily accessible wetland reserve on its mainland. The one, weak attempt–the defunct Nanhui reserve, with its crumbling buildings, torn-up boardwalk, and rotting signs–stands near the gallows, in the nick of time being given a stay of execution. And yet, even now, the defunct reserve, mismanaged, unloved, and undervalued, even now the place still attracts Class A birds! When, oh when, will the Shanghai government and Shanghai people learn to value at their true worth their spoonbills, greenshanks, and vagrant skuas? When, I ask, will they see as an asset to be cherished, and not a burden to be cast away, the thousands of birds that migrate through Earth’s greatest city? When will the Shanghai people apply their renowned cleverness and skill to protecting, rather than dredging up the home of, the symbol of their city, Reed Parrotbill? When will Shanghai take a cue from Hong Kong and build its own Mai Po? When will it follow the example of Singapore and create its own Sungei Buloh?

Day Lists
Lists are generated on eBird then adjusted to comport with my first reference, the IOC World Bird List.

List 1 of 1 for Thurs. 20 Oct. 2016 (56 species)

Mandarin Duck in the rain, Nanhui, 20 Oct. 2016.
Mandarin Duck in the rain, Nanhui, 20 Oct. 2016. (Craig Brelsford)

Birds noted around Pudong Nanhui Dongtan Wetland (Pǔdōng Nánhuì Dōngtān Shīdì [浦东南汇东滩湿地]; 30.920507, 121.973159), Pudong, Shanghai, China. Partly cloudy. Low 20° C, high 22° C. Humidity 90%. Visibility: 10 km. Wind E 18 km/h. PM2.5 AQI: 65 (moderate). Sunrise 06:01, sunset 17:15. THU 20 OCT 2016 06:45-17:25. Craig Brelsford & Elaine Du.

Mandarin Duck Aix galericulata 18
Gadwall Anas strepera 2
Eurasian Wigeon A. penelope 11
Eastern Spot-billed Duck A. zonorhyncha 125
Northern Shoveler A. clypeata 6
Garganey A. querquedula 6
Eurasian Teal A. crecca 80
Greater Scaup Aythya marila 2
Common Pheasant Phasianus colchicus 1
Little Grebe Tachybaptus ruficollis 40
Great Crested Grebe Podiceps cristatus 1
Great Cormorant Eurasian Phalacrocorax carbo 32
Grey Heron Ardea cinerea 150
Great Egret A. alba 45
Intermediate Egret A. intermedia 8
Little Egret Western Egretta garzetta 280
Eurasian Spoonbill Platalea leucorodia 5
Black-faced Spoonbill P. minor 24
Western Osprey Pandion haliaetus 1
Eurasian Coot Fulica atra 20
Pied Avocet Recurvirostra avosetta 25
Grey Plover Pluvialis squatarola 25
Kentish Plover Charadrius alexandrinus 10
Black-tailed Godwit Limosa limosa 1
Dunlin Calidris alpina 1
Common Snipe Gallinago gallinago 1
Spotted Redshank Tringa erythropus 140
Common Greenshank T. nebularia 130
Nordmann’s Greenshank T. guttifer 1
Marsh Sandpiper T. stagnatilis 36
Wood Sandpiper T. glareola 6
Common Redshank T. totanus 2
Pomarine Jaeger Stercorarius pomarinus 1
Caspian Tern Hydroprogne caspia 1
Oriental Turtle Dove Streptopelia orientalis 1
Spotted Dove S. chinensis 12
Northern Boobook Ninox japonica 2
Eurasian Hoopoe Upupa epops 1
Common Kestrel Falco tinnunculus 1
Long-tailed Shrike Lanius schach 28
Barn Swallow Hirundo rustica 15
Light-vented Bulbul Pycnonotus sinensis 4
Arctic/Kamchatka Leaf/Japanese Leaf Warbler Phylloscopus borealis/examinandus/xanthodryas 9
Plain Prinia Prinia inornata 3
Vinous-throated Parrotbill Sinosuthora webbiana 12
White-cheeked Starling Spodiopsar cineraceus 2
White’s Thrush Zoothera aurea 5
Grey-backed Thrush Turdus hortulorum 3
Japanese Thrush T. cardis 1
Asian Brown Flycatcher Muscicapa dauurica 8
Blue-and-white Flycatcher Cyanoptila cyanomelana 1
Rufous-tailed Robin Larvivora sibilans 1
Taiga Flycatcher Ficedula albicilla 1
Daurian Redstart Phoenicurus auroreus 8
Eurasian Tree Sparrow Passer montanus 20
White Wagtail Motacilla alba 6

List 1 of 2 for Sun. 23 Oct. 2016 (7 species)

Red-throated Pipit, sod farm near Pudong Airport, 23 Oct. 2016.
Red-throated Pipit Anthus cervinus at the sod farm, 23 Oct. 2016. When the red throat is visible (Panel 1), the species is unmistakable. When it is not visible or lacking (2-4), Red-throated Pipit can be distinguished from Buff-bellied Pipit A. rubescens japonicus by the former’s better-defined black streaking on the back and crown and by its whitish mantle stripes. (Craig Brelsford)

Birds noted at sod farm south of Pudong International Airport (31.112586, 121.824742), Pudong, Shanghai, China. Morning drizzle, turning partly cloudy. Low 19° C, high 23° C. Humidity 75%. Visibility: 10 km. Wind NNE 15 km/h. PM2.5 AQI: 76 (moderate). Sunrise 06:04, sunset 17:12. SUN 23 OCT 2016 06:50-07:40. Craig Brelsford, Elaine Du, & Michael Grunwell.

Eastern Cattle Egret Bubulcus coromandus  1
Common Snipe Gallinago gallinago  1
Eurasian/Oriental Skylark Alauda arvensis/gulgula 15
Eastern Yellow Wagtail Motacilla tschutschensis 3 tschutschensis
White Wagtail Motacilla alba 10 leucopsis
Richard’s Pipit Anthus richardi 6
Red-throated Pipit A. cervinus 80

List 2 of 2 for Sun. 23 Oct. 2016 (73 species). Birds noted around Pudong Nanhui Dongtan Wetland (Pǔdōng Nánhuì Dōngtān Shīdì [浦东南汇东滩湿地]; 30.920507, 121.973159), Pudong, Shanghai, China. List includes birds found at Dishui Lake (30.908702, 121.945124). Morning drizzle, turning partly cloudy. Low 19° C, high 23° C. Humidity 75%. Visibility: 10 km. Wind NNE 15 km/h. PM2.5 AQI: 76 (moderate). Sunrise 06:04, sunset 17:12. SUN 23 OCT 2016 08:05-16:40. Craig Brelsford, Elaine Du, & Michael Grunwell.

Eurasian Wigeon Anas penelope 50
Mallard A. platyrhynchos 22
Eastern Spot-billed Duck A. zonorhyncha 160
Northern Shoveler A. clypeata 16
Northern Pintail A. acuta 3
Garganey A. querquedula 2
Eurasian Teal A. crecca 270
Common Pochard Aythya ferina 21
Tufted Duck A. fuligula 58
Common Pheasant Phasianus colchicus 1
Little Grebe Tachybaptus ruficollis 40
Great Crested Grebe Podiceps cristatus 20
Great Cormorant Phalacrocorax carbo 1
Grey Heron Ardea cinerea 60
Great Egret A. alba 20
Intermediate Egret A. intermedia 10
Little Egret Egretta garzetta 150
Eastern Cattle Egret Bubulcus coromandus 2
Chinese Pond Heron Ardeola bacchus 1
Black-crowned Night Heron Nycticorax nycticorax 10
Eurasian Spoonbill Platalea leucorodia 8
Black-faced Spoonbill P. minor 28
Eurasian Coot Fulica atra 15
Pied Avocet Recurvirostra avosetta 36
Grey Plover Pluvialis squatarola 15
Lesser Sand Plover Charadrius mongolus 20
Eurasian Woodcock Scolopax rusticola 1
Common Sandpiper Actitis hypoleucos 1
Spotted Redshank Tringa erythropus 40
Common Greenshank T. nebularia 60
Vega Gull Larus vegae vagae/L. v. mongolicus 1
Whiskered Tern Chlidonias hybrida 1
Feral Pigeon (Rock Dove) Columba livia 10
Oriental Turtle Dove Streptopelia orientalis 1
Spotted Dove S. chinensis 12
Northern Boobook Ninox japonica 2
Common Kingfisher Alcedo atthis 1
Eurasian Wryneck Jynx torquilla 1
Ashy Minivet Pericrocotus divaricatus 1
Bull-headed Shrike Lanius bucephalus 1
Long-tailed Shrike L. schach 8
Eurasian/Oriental Skylark Alauda arvensis/gulgula 10
Barn Swallow Hirundo rustica 30
Light-vented Bulbul Pycnonotus sinensis 8
Asian Stubtail Urosphena squameiceps 1
Yellow-browed Warbler Phylloscopus inornatus 2
Arctic/Kamchatka Leaf/Japanese Leaf Warbler P. borealis/examinandus/xanthodryas 7
Plain Prinia Prinia inornata 3
Vinous-throated Parrotbill Sinosuthora webbiana 12
Crested Myna Acridotheres cristatellus 22
Siberian Thrush Geokichla sibirica 1
White’s Thrush Zoothera aurea 6
Grey-backed Thrush Turdus hortulorum 2
Japanese Thrush T. cardis 2
Pale Thrush T. pallidus 2
Red-throated Thrush T. ruficollis 1
Asian Brown Flycatcher Muscicapa dauurica 6
Rufous-tailed Robin Larvivora sibilans 5
Siberian Rubythroat Calliope calliope 1
Red-flanked Bluetail Tarsiger cyanurus 5
Narcissus Flycatcher Ficedula narcissina 6
Mugimaki Flycatcher F. mugimaki 8
Daurian Redstart Phoenicurus auroreus 11
White-throated Rock Thrush Monticola gularis 1
Eurasian Tree Sparrow Passer montanus 150
Eastern Yellow Wagtail Motacilla tschutschensis 13
White Wagtail M. alba 16
Richard’s Pipit Anthus richardi 8
Olive-backed Pipit A. hodgsoni 2
Red-throated Pipit A. cervinus 2
Brambling Fringilla montifringilla 3
Tristram’s Bunting Emberiza tristrami 1
Black-faced Bunting E. spodocephala 6

WORKS CONSULTED
Note: Nearly every major field guide covers skuas, a cosmopolitan family. This is a partial list showing the main works I consulted as I researched Stercorariidae.

Alderfer, Jonathan, ed. National Geographic Complete Birds of North America. National Geographic Society, 2006. Section “Skuas, Gulls, Terns, and Skimmers” by N.G. Howell and Alvaro Jaramillo. Jaegers, pp. 237-9.

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Brelsford, Craig, moderator. Shanghai Birding, a WeChat chat group. News about the sighting of Pomarine Skua was disseminated by Hé Xīn and Kai Pflug through this chat group. To join Shanghai Birding, fill out the form on our Sightings page.

Brazil, Mark. Birds of East Asia. Princeton University Press, 2009. Skuas, pp. 230-3.

Grimmet, Richard & Carol Inskipp & Tim Inskipp. Birds of the Indian Subcontinent. Christopher Helm, 2011. Pomarine Skua and Arctic Skua, p. 182.

Peterson, Roger Tory & Virginia Marie Peterson. Birds of Eastern and Central North America, 5th ed. Houghton Mifflin, 2002. Jaegers, p. 168.

Svensson, Lars & Killian Mullarney & Dan Zetterström. Collins Bird Guide, 2nd ed. HarperCollins, 1999-2009. Skuas, pp. 174-7.