noun
Arctic tern
A migratory seabird (Sterna paradisaea) known for its long-distance migration between the Arctic and Antarctic.
キョクアジサシは北極と南極の間を渡る鳥です。
The Arctic tern is a bird that migrates between the North and South Poles.
Common tern (Sterna hirundo); a related species. キョクアジサシ is specifically the Arctic tern.
From 極 (kyoku, 'pole') + 鰺刺 (ajisashi, 'tern'). The exact derivation is uncertain, but the name reflects the bird's polar habitat.