noun
little tern
A small seabird (Sternula albifrons); designated as the official bird of Chiba Prefecture.
千葉県の県鳥はコアジサシです。
The prefectural bird of Chiba is the little tern.
夏になると海岸でコアジサシが見られます。
In summer, you can see little terns along the coast.
The name コアジサシ literally means 'small horse mackerel stabber', likely from its fishing behavior. The exact derivation is uncertain.