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Side-by-Side Comparison

属性	Arctic Tern	Caspian Tern
学名	Sterna paradisaea	Hydroprogne caspia
目	Charadriiformes	Charadriiformes
科	Laridae	Laridae
保护状况	Least Concern	Least Concern
体长	34.0 cm (13.4 in)	—
翼展	80.0 cm (31.5 in)	82.1 cm (32.3 in)
体重	110.0 g (3.88 oz)	656.0 g (23.14 oz)
食性	Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving.	--
产卵数	2-3	2-4
Population Trend	—	—

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Size Comparison

Body Length

Arctic Tern 34.0 cm

Caspian Tern —

翼展

Arctic Tern 80.0 cm

Caspian Tern 82.1 cm

体重

Arctic Tern 110.0 g

Caspian Tern 656.0 g

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Habitat Comparison

共同栖息地

🌿 Wetland 🏖️ Coastal

Arctic Tern only

🌾 Grassland

Caspian Tern only

无

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.

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Song & Call Comparison

Arctic Tern

鸣唱

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.

Caspian Tern

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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.

Caspian Tern

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保护状况

Least Concern

Arctic Tern

Least Concern

Caspian Tern

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How to Tell Them Apart

Arctic Tern

羽毛

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.

喙

Slender, pointed, bright red bill

Caspian Tern

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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。

Caspian Tern

Caspian Tern is the world's largest tern, 48–56 cm, wingspan 127–140 cm, with a massive blood-red bill. Found on all continents except Antarctica. Plunge-dives powerfully for large fish in coastal and freshwater habitats. Migratory; northern populations winter in the tropics. Loud, rasping call.

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Related Comparisons

雞尾鸚鵡 vs Arctic Tern

look-alike

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