also: せぐろあじさし
noun
sooty tern
A seabird species (Onychoprion fuscatus). The name is usually written in katakana.
セグロアジサシは熱帯の島で繁殖する。
Sooty terns breed on tropical islands.
The name セグロアジサシ literally means 'black-backed tern', from 背 (se, 'back'), 黒 (kuro, 'black'), and 鰺刺 (ajisashi, 'tern'). The exact derivation is uncertain, but it is a descriptive compound.