Arctic tern
Arctic tern
Tern species (Sterna paradisaea) that makes the longest annual migration of any bird. It breeds in the southerly reaches of the Arctic and winters in the Antarctic, making its migration a round-trip of nearly 22,000 mi (over 35,000 km). Its appearance—white with a black cap and grayish wings—is similar to that of the common tern (S. hirundo), its frequent companion.
This entry comes from Encyclopædia Britannica Concise.
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