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Side-by-Side Comparison

属性	Arctic Tern	South American Tern
学名	Sterna paradisaea	Sterna hirundinacea
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)	59.3 cm (23.3 in)
体重	110.0 g (3.88 oz)	190.25 g (6.71 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

South American Tern —

翼開長

Arctic Tern 80.0 cm

South American Tern 59.3 cm

体重

Arctic Tern 110.0 g

South American Tern 190.25 g

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Habitat Comparison

共通生息地

🌿 Wetland 🏖️ Coastal

Arctic Tern only

🌾 Grassland

South American 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.

South American 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.

South American Tern

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保全状況

Least Concern

Arctic Tern

Least Concern

South American 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

South American 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。

South American Tern

South American Tern, 40–44 cm, is the largest South American tern, breeding from Peru around Cape Horn to southeastern Brazil. Red bill, grey mantle, black cap. Pelagic and coastal piscivore; strong plunge-diver. Movements poorly known; some populations may migrate north along both coasts.

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Related Comparisons

オカメインコ vs Arctic Tern

look-alike

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