A tern (Sterna paradisaea) that is noted for its extremely long migrations, typically from the Arctic to the Antarctic and back each year. 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