一箭双雕；一举两得。
Fine feathers make fine birds.
人要衣装，马要鞍。
Birds in their little nests agree.
同巢之鸟心儿齐。
Birds of a feather flock together.
物以类聚，人以群分。
Each bird loves to hear himself sing.
鸟儿都爱听自己唱。（自我欣赏）
It’s an ill bird that fouls own nest.
家丑不可外扬。
You cannot catch old birds with chaff.
（粗糠） 用粗糠捉不住老鸟。（有经验的人难骗。）
A bird in the hand is worth two in the bush.
双鸟在林不如一鸟在手。
A bird is known by its note, and a man by his talk.
听音识鸟，闻言识人。