晩ばん成せい性せい

noun which may take the genitive case particle 'no', noun

altricial; altricious

Biological term describing animals born in a helpless state, requiring parental care. Used as a noun or with の to modify another noun.

• スズメは晩ばん成せい性せいの鳥とりで、孵ふ化かしたばかりの雛ひなは目めも開ひらいていない。

  Sparrows are altricial birds; newly hatched chicks have their eyes closed.

• 哺ほ乳にゅう類るいの中なかには晩ばん成せい性せいの種しゅと早そう成せい性せいの種しゅがいる。

  Among mammals, there are altricial and precocial species.