Black Tern vs Heermann's Gull
Chlidonias niger مقارنةً بـ Larus heermanni
Side-by-Side Comparison
| السمة | Black Tern | Heermann's Gull |
|---|---|---|
| الاسم العلمي | Chlidonias niger | Larus heermanni |
| الرتبة | Charadriiformes | Charadriiformes |
| الفصيلة | Laridae | Laridae |
| حالة الحفاظ | Least Concern | Near Threatened |
| الطول | — | — |
| طول الجناح | 40,3 cm (15.9 in) | 67,2 cm (26.5 in) |
| الوزن | 73,15 g (2.58 oz) | 448,26666666666665 g (15.81 oz) |
| النظام الغذائي | -- | -- |
| عدد البيض في الوضع | 2-3 | 1-2 |
| Population Trend | — | — |
Habitat Comparison
حالة الحفاظ
Least Concern
Black Tern
Near Threatened
Heermann's Gull
About These Birds
Black Tern
Black Tern, 22–24 cm, breeds on freshwater marshes of North America and Eurasia. Breeding plumage: sooty black body, grey wings. Insectivore and piscivore; buoyant, dipping flight over wetlands. Migratory; winters off West African coasts and in tropical America. Declining in Europe.
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.