冬ふゆ毛げ

noun

winter fur; winter coat; winter plumage

Refers to the thick fur or feathers that animals grow for winter. Used for mammals and birds.

• ウサギは冬ふゆになると冬ふゆ毛げに生はえ変かわる。

  Rabbits grow their winter coat when winter comes.

• この鳥とりの冬ふゆ毛げは夏なつよりも白しろっぽい。

  This bird's winter plumage is whiter than in summer.