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Side-by-Side Comparison

属性	Arctic Tern	Least Tern
学名	Sterna paradisaea	Sternula antillarum
目	Charadriiformes	Charadriiformes
科	Laridae	Laridae
保全状況	Least Concern	Least Concern
体長	34.0 cm (13.4 in)	—
翼開長	80.0 cm (31.5 in)	33.0 cm (13.0 in)
体重	110.0 g (3.88 oz)	46.75 g (1.65 oz)
食性	Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving.	--
一腹卵数	2-3	1-3
Population Trend	—	—

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Size Comparison

Body Length

Arctic Tern 34.0 cm

Least Tern —

翼開長

Arctic Tern 80.0 cm

Least Tern 33.0 cm

体重

Arctic Tern 110.0 g

Least Tern 46.75 g

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Habitat Comparison

共通生息地

🌿 Wetland 🏖️ Coastal

Arctic Tern only

🌾 Grassland

Least Tern only

None

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

さえずり

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.

Least 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.

Least Tern

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保全状況

Least Concern

Arctic Tern

Least Concern

Least 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.

くちばし

Slender, pointed, bright red bill

Least Tern

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About These Birds

Arctic Tern

キョクアジサシはあらゆる動物の中で最長の渡りを行い、毎年北極と南極を往復する約7万kmの旅をする。30年の寿命の中に、月への往復3回分に相当する飛翔距離を積み重ねる可能性がある。地球上でどの生物よりも多くの昼光を経験するこの驚異的な鳥は、太陽を追い続ける。

Least Tern

Least Tern is North America's smallest tern, 22–24 cm, breeding on sandy beaches and river sandbars from the Atlantic coast to the interior. Endangered (interior subspecies). Yellow bill, white forehead, grey upperparts. Hovers and plunge-dives for small fish in coastal and riverine habitats.

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Related Comparisons

オカメインコ vs Arctic Tern

look-alike

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