Armenian Gull vs Black-tailed Gull

Armenian Gull

Larus armenicus

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The Armenian gull is a fairly large gull species, though it is on average the smallest of the "herring gull" complex. It can range from 52 to 62 cm (20 to 24 in), from 120 to 145 cm (47 to 57 in) across the wings, and weighs from 600 to 960 g (1.32 to 2.12 lb). Among standard measurements, its wing chord is 38.5 to 45.8 cm (15.2 to 18.0 in), its bill is 4.1 to 5.6 cm (1.6 to 2.2 in) and its tarsus is 5.7 to 6.4 cm (2.2 to 2.5 in). They are superficially similar to yellow-legged gulls but are slightly smaller with a slightly darker grey back and dark eyes.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Donsky · CC BY 4.0

Black-tailed Gull

Larus crassirostris

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The black-tailed gull is medium-sized (46 cm or 18.1 in), with a wingspan of 126–128 cm (49.6–50.4 in). It has yellow legs and a red and black spot at the end of the bill. Males and females have identical plumage and features, although males are larger in size than females. This gull takes four years to reach full adult plumage. As the name suggests, it has a black tail. The bird has a cat-like call, giving it its Japanese name — umineko (海猫, 'sea cat'), and Korean name — gwaeng-yi gull, which means 'cat' gull. In Hachinohe their calls are one of the 100 Soundscapes of Japan.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Angie from Sawara, Chiba-ken, Japan · CC BY 2.0

Photos and recordings are credited to their authors under the licence shown. Full profiles: Armenian Gull and Black-tailed Gull.