Black-tailed Gull vs Heermann's Gull
Larus crassirostris so với Larus heermanni
Side-by-Side Comparison
| Thuộc Tính | Black-tailed Gull | Heermann's Gull |
|---|---|---|
| Tên Khoa Học | Larus crassirostris | Larus heermanni |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Least Concern | Near Threatened |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 72,8 cm (28.7 in) | 67,2 cm (26.5 in) |
| Khối Lượng | 675,0 g (23.81 oz) | 448,26666666666665 g (15.81 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 2-3 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
Tình Trạng Bảo Tồn
Least Concern
Black-tailed Gull
Near Threatened
Heermann's Gull
About These Birds
Black-tailed Gull
Black-tailed Gull, 44–48 cm, is common on East Asian coasts from Russia to China, Japan, and Korea. Grey mantle, white body, yellow bill with red spot and black subterminal band, yellow legs. Omnivore; very vocal, known as the 'cat gull' for its mewing calls. Migratory; winters south to Vietnam.
Heermann's Gull
Heermann's Gull, 46–51 cm, is distinctive — dark grey body, white head (breeding), red bill. Breeds almost entirely on Isla Rasa in the Gulf of California, then disperses north along the Pacific coast to British Columbia. Kleptoparasite; steals fish from Brown Pelicans. Near Threatened; range highly restricted.