Heermann's Gull vs Aleutian Tern
Larus heermanni в сравнении с Onychoprion aleuticus
Side-by-Side Comparison
| Характеристика | Heermann's Gull | Aleutian Tern |
|---|---|---|
| Научное название | Larus heermanni | Onychoprion aleuticus |
| Отряд | Charadriiformes | Charadriiformes |
| Семейство | Laridae | Laridae |
| Охранный статус | Near Threatened | Vulnerable |
| Длина | — | — |
| Размах крыльев | 67,2 cm (26.5 in) | 52,4 cm (20.6 in) |
| Масса | 448,26666666666665 g (15.81 oz) | 104,88 g (3.70 oz) |
| Питание | -- | -- |
| Размер кладки | 1-2 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Охранный статус
Near Threatened
Heermann's Gull
Vulnerable
Aleutian Tern
About These Birds
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.
Aleutian Tern
Aleutian Tern, 32–34 cm, breeds colonially in Alaska and Russian Far East, wintering in Southeast Asian waters — one of the most poorly tracked migrations among seabirds. Dark grey above, white below, black cap with white forehead. Piscivore; dives for small fish. Near Threatened.