Kill two birds with one stone. 
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。