Arctic Tern vs Black-legged Kittiwake
Sterna paradisaea 对比 Rissa tridactyla
Side-by-Side Comparison
| 属性 | Arctic Tern | Black-legged Kittiwake |
|---|---|---|
| 学名 | Sterna paradisaea | Rissa tridactyla |
| 目 | Charadriiformes | Charadriiformes |
| 科 | Laridae | Laridae |
| 保护状况 | Least Concern | Vulnerable |
| 体长 | 34.0 cm (13.4 in) | — |
| 翼展 | 80.0 cm (31.5 in) | 60.2 cm (23.7 in) |
| 体重 | 110.0 g (3.88 oz) | 439.3333333333333 g (15.50 oz) |
| 食性 | Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving. | -- |
| 产卵数 | 2-3 | 1-3 |
| Population Trend | — | — |
Size Comparison
Habitat Comparison
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-legged Kittiwake
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-legged Kittiwake
保护状况
Arctic Tern
Black-legged Kittiwake
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-legged Kittiwake
About These Birds
Arctic Tern
北极燕鸥进行所有动物中最长的迁徙，每年从北极繁殖地飞往南极越冬地，往返距离超过70,000公里。体型纤细，翼展约80厘米，全身主要为白色，具黑色头冠和红色喙。无危；繁殖于北极和亚北极海岸及岛屿，全球种群约200万只。
Black-legged Kittiwake
三趾鸥（约400克）是一种典型的海洋性鸥类，在陡峭悬崖上筑巢，在大洋上度过非繁殖季节。翅尖纯黑，后趾退化（由此得名）。以鱼类和浮游动物为食。易危；近几十年来某些种群数量大幅下降，可能与鱼类减少和气候变化有关。