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Side-by-Side Comparison

属性	Arctic Tern	Black-bellied Tern
学名	Sterna paradisaea	Sterna acuticauda
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)	44.8 cm (17.6 in)
体重	110.0 g (3.88 oz)	159.5 g (5.63 oz)
食性	Small fish and crustaceans caught by plunge-diving from the air. Hovers briefly before diving.	--
一腹卵数	2-3	2-3
Population Trend	—	—

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Size Comparison

Body Length

Arctic Tern 34.0 cm

Black-bellied Tern —

翼開長

Arctic Tern 80.0 cm

Black-bellied Tern 44.8 cm

体重

Arctic Tern 110.0 g

Black-bellied Tern 159.5 g

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Habitat Comparison

共通生息地

🌿 Wetland

Arctic Tern only

🌾 Grassland 🏖️ Coastal

Black-bellied 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-bellied 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-bellied Tern

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保全状況

Least Concern

Arctic Tern

Endangered

Black-bellied 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-bellied 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-bellied Tern

Black-bellied Tern, 32–34 cm, is an Endangered freshwater tern of the Indian subcontinent, breeding on large river sandbars from Pakistan to Myanmar. Black belly contrasts with grey upperparts in breeding plumage; orange bill. Plunge-dives for small fish. Severely threatened by river modification.

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Related Comparisons

オカメインコ vs Arctic Tern

look-alike

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