Black-billed Gull vs Aleutian Tern
Larus bulleri so với Onychoprion aleuticus
Side-by-Side Comparison
| Thuộc Tính | Black-billed Gull | Aleutian Tern |
|---|---|---|
| Tên Khoa Học | Larus bulleri | Onychoprion aleuticus |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Near Threatened | Vulnerable |
| Chiều Dài | — | — |
| Chiều Dài Sải Cánh | 57,5 cm (22.6 in) | 52,4 cm (20.6 in) |
| Khối Lượng | 216,83333333333334 g (7.65 oz) | 104,88 g (3.70 oz) |
| Chế Độ Ăn | -- | -- |
| Số Trứng | 1-3 | 1-4 |
| Population Trend | — | — |
Habitat Comparison
Môi Trường Sống Chung
Black-billed Gull only
Không
Aleutian Tern only
Tình Trạng Bảo Tồn
Near Threatened
Black-billed Gull
Vulnerable
Aleutian Tern
About These Birds
Black-billed Gull
Black-billed Gull, 35–38 cm, is endemic to New Zealand, breeding on South Island braided riverbeds. All-white plumage with a slender black bill and black-tipped wings. Endangered; river modification and mammal predation depress breeding success. Insectivore and piscivore in river and coastal habitats.
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.