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− | [[Image: | + | [[Image:Saunderss Gull.jpg|thumb|550px|right|Adult summer<br />Photo by {{user|ilovebird|Y. J. Choi}} <br />[[South Korea]], 31 May 2006]] |
;[[: Category:Saundersilarus|Saundersilarus]] saundersi | ;[[: Category:Saundersilarus|Saundersilarus]] saundersi | ||
''Chroicocephalus saundersi''<br /> | ''Chroicocephalus saundersi''<br /> | ||
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Length 29–33 cm; no information on wingspan or weight<br /> | Length 29–33 cm; no information on wingspan or weight<br /> | ||
'''Breeding adult''' | '''Breeding adult''' | ||
+ | [[Image:Chroicocephalus saundersi, winter.jpg|thumb|350px|right|Adult winter<br />Photo by {{user|Akiko+Hidaka|Akiko Hidaka}} <br />Kanto, [[Japan]], December 2008]] | ||
*Short black or blackish-red bill and black eye | *Short black or blackish-red bill and black eye | ||
*Full black head with conspicuous white eye lids | *Full black head with conspicuous white eye lids |
Revision as of 19:25, 5 September 2017
- Saundersilarus saundersi
Chroicocephalus saundersi
Larus saundersi
Identification
Length 29–33 cm; no information on wingspan or weight
Breeding adult
- Short black or blackish-red bill and black eye
- Full black head with conspicuous white eye lids
- Pale grey mantle and upperwing, with white trailing edge to secondaries, white outer two primaries with black subterminal marks on 2nd-5th primaries
- Underwing whitish, except for blackish-grey undersides to 3rd-5th primaries
- Body and tail white
- Dark red legs
Winter adult
- As breeding adult, but head white with a blackish smudge behind the eye.
First year
- Juvenile scaly brown above
- First-winter with pale grey mantle, narrow black terminal tail band, and patterned wing with black tips to secondaries, black tips and front edges of outer primaries, and brown patches on coverts. Bill and legs blackish.
Similar Species
Overall plumage pattern is very similar to Black-headed Gull and Bonaparte's Gull; from the former, differs in smaller overall size, shorter, black bill, black summer hood, and slightly less black on primary tips; from the latter (which is about the same size), differs in the stouter bill, and darker underwing pattern (more like Black-headed).
Distribution
Breeds around the coasts of the Yellow Sea in northeastern China and probably North Korea; formerly also bred in eastern South Korea. Winters on the eastern and southern coasts of China (including Hong Kong and Macao), southern Japan, South Korea, Taiwan, and Vietnam. Vagrant in southeasternmost Russia.
Taxonomy
This is a monotypic species[1].
Its generic placement is disputed; some authorities place it in its own genus Saundersilarus [1], while others place it in Chroicocephalus[2]. Like most other gulls, it was formerly included in Larus.
Habitat
Estuarine waters and intertidal marshes.
Status
Classified as Vulnerable in the 2008 IUCN Red List.3 It is threatened by habitat loss.
Behaviour
Reported to mix with Gull-billed Tern when feeding.
References
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
- Gill, F. and Donsker, D. (Eds). 2017. IOC World Bird Names (version 7.3). Available at http://www.worldbirdnames.org/.
- BirdLife International (2008) Species factsheet: Larus saundersi. Downloaded from http://www.birdlife.org on 12/9/2008.