Any of more than 20 species of Black perching Birds (see passerine) of the genus Corvus (family Corvidae) that are smaller than most ravens and have a thinner Bill.

  • 雀形目鸦科鸦属二十多种黑色鸣禽的俗称,比大多数渡鸦小,嘴也不那么厚实。
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