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beak; bill
カラスがくちばしでゴミ袋を器用に破いていた。
A crow was skillfully tearing open a garbage bag with its beak.
くちばしの長さは種類によって大きく異なる。
Beak length varies greatly depending on the species.
親鳥がくちばしで餌を雛に与えていた。
The parent bird was feeding its chick with its beak.