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Side-by-Side Comparison

属性	Arctic Tern	Red-legged Kittiwake
学名	Sterna paradisaea	Rissa brevirostris
目	Charadriiformes	Charadriiformes
科	Laridae	Laridae
保全状況	Least Concern	Vulnerable
体長	34.0 cm (13.4 in)	—
翼開長	80.0 cm (31.5 in)	60.0 cm (23.6 in)
体重	110.0 g (3.88 oz)	401.6666666666667 g (14.17 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

Red-legged Kittiwake —

翼開長

Arctic Tern 80.0 cm

Red-legged Kittiwake 60.0 cm

体重

Arctic Tern 110.0 g

Red-legged Kittiwake 401.6666666666667 g

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Habitat Comparison

共通生息地

🏖️ Coastal

Arctic Tern only

🌿 Wetland 🌾 Grassland

Red-legged Kittiwake 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.

Red-legged Kittiwake

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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.

Red-legged Kittiwake

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保全状況

Least Concern

Arctic Tern

Vulnerable

Red-legged Kittiwake

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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

Red-legged Kittiwake

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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。

Red-legged Kittiwake

Red-legged Kittiwake, 35–39 cm, has a very restricted range on only four Aleutian and Pribilof Island colonies, with a world population under 200,000. Resembles Black-legged Kittiwake but with bright red legs, darker upperparts, and white underwing tips. Pelagic piscivore; Vulnerable and declining.

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Related Comparisons

オカメインコ vs Arctic Tern

look-alike

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