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Side-by-Side Comparison

属性	Arctic Tern	Black-fronted Tern
学名	Sterna paradisaea	Chlidonias albostriatus
目	Charadriiformes	Charadriiformes
科	Laridae	Laridae
保全状況	Least Concern	Endangered
体長	34.0 cm (13.4 in)	—
翼開長	80.0 cm (31.5 in)	47.9 cm (18.9 in)
体重	110.0 g (3.88 oz)	93.0 g (3.28 oz)
食性	Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving.	--
一腹卵数	2-3	2
Population Trend	—	—

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Size Comparison

Body Length

Arctic Tern 34.0 cm

Black-fronted Tern —

翼開長

Arctic Tern 80.0 cm

Black-fronted Tern 47.9 cm

体重

Arctic Tern 110.0 g

Black-fronted Tern 93.0 g

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Habitat Comparison

共通生息地

🌿 Wetland 🏖️ Coastal

Arctic Tern only

🌾 Grassland

Black-fronted 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.

Black-fronted 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.

Black-fronted Tern

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保全状況

Least Concern

Arctic Tern

Endangered

Black-fronted 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

Black-fronted 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。

Black-fronted Tern

クロビタイアジサシ、27〜30 cm。ニュージーランド南島固有の準絶滅危惧種で、砂利河床で繁殖。橙色の嘴・青灰色の体・黒い頭頂；幼鳥は褐色。魚食性および昆虫食性。

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Related Comparisons

オカメインコ vs Arctic Tern

look-alike

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