成せい鳥ちょう

noun

adult bird

Refers to a bird that has reached maturity, as opposed to a chick or juvenile. Used in ornithological and general contexts.

• この森もりでは、春はるになると多おおくの成せい鳥ちょうが巣すを作つくる。

  In this forest, many adult birds build nests in spring.

• ヒナと成せい鳥ちょうでは羽はねの色いろが異ことなる。

  The feather color differs between chicks and adult birds.