Arctic Tern vs Black-bellied Tern
Sterna paradisaea so với Sterna acuticauda
Side-by-Side Comparison
| Thuộc Tính | Arctic Tern | Black-bellied Tern |
|---|---|---|
| Tên Khoa Học | Sterna paradisaea | Sterna acuticauda |
| Bộ | Charadriiformes | Charadriiformes |
| Họ | Laridae | Laridae |
| Tình Trạng Bảo Tồn | Least Concern | Endangered |
| Chiều Dài | 34,0 cm (13.4 in) | — |
| Chiều Dài Sải Cánh | 80,0 cm (31.5 in) | 44,8 cm (17.6 in) |
| Khối Lượng | 110,0 g (3.88 oz) | 159,5 g (5.63 oz) |
| Chế Độ Ăn | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| Số Trứng | 2-3 | 2-3 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
Môi Trường Sống Chung
Arctic Tern only
Black-bellied Tern only
Không
Arctic Tern
Breeds on coastal and tundra habitats. Spends most of its life at sea over the open ocean. Nests in colonies on beaches and rocky shores.
Song & Call Comparison
Arctic Tern
A sharp, grating 'kree-yah' alarm call. Also gives 'kik-kik-kik' near the nest. Highly aggressive vocally during the Arctic breeding season. Calls are harsh and insistent.
Black-bellied Tern
Geographic Range & Migration
Arctic Tern
Breeds in the Arctic and sub-Arctic. Migrates to the Antarctic, experiencing two summers per year. Found on every ocean.
Black-bellied Tern
Tình Trạng Bảo Tồn
Arctic Tern
Black-bellied Tern
How to Tell Them Apart
Arctic Tern
Pale grey upperparts, white underparts with a black cap. Blood-red bill and short red legs. Deeply forked tail streamers. Winter adults lose the full black cap.
Slender, pointed, bright red bill
Black-bellied Tern
About These Birds
Arctic Tern
The Arctic tern holds the record for the longest known migration of any animal, traveling roughly 70,000 km annually from Arctic to Antarctic and back. Over its 30-year lifespan, it may fly the equivalent of three round trips to the Moon. This remarkable bird experiences more daylight than any other creature on Earth.
Black-bellied Tern
Black-bellied Tern, 32–34 cm, is an Endangered freshwater tern of the Indian subcontinent, breeding on large river sandbars from Pakistan to Myanmar. Black belly contrasts with grey upperparts in breeding plumage; orange bill. Plunge-dives for small fish. Severely threatened by river modification.