Heermann's Gull vs Aleutian Tern
Larus heermanni so với Onychoprion aleuticus
Side-by-Side Comparison
| Thuộc Tính | Heermann's Gull | Aleutian Tern |
|---|---|---|
| Tên Khoa Học | Larus heermanni | Onychoprion aleuticus |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Near Threatened | Vulnerable |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 67,2 cm (26.5 in) | 52,4 cm (20.6 in) |
| Khối Lượng | 448,26666666666665 g (15.81 oz) | 104,88 g (3.70 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 1-2 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Heermann's Gull only
Không
Aleutian Tern only
Tình Trạng Bảo Tồn
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.