birds of a feather

1. 一丘之貉
   I'm not surprised those two are such friends; they're birds of a feather.

   那两个人交情这么好我不惊讶，他们是一丘之貉嘛。

A bird in the hand is worth two in the bush.

1. 双鸟在林不如一鸟在手。

early bird

1. 早起者
   In the business world, remember: the early bird gets the worm.

   身在商业界，切记：早起的鸟儿有虫吃。

   He's quite an early bird.

   他是个早起者。

give the bird

1. 发嘘声
   They started to give the actor the bird when they saw his performance was bad.

   他们见到那演员的演出那么差，就开始对他发出嘘声。

• the bird has flown
  the person one is looking for has escaped or left.
• the birds and the bees
  informal basic facts about sex and reproduction, as told to a child.
• do (one's) bird
  Brit. informal serve a prison sentence. [bird from rhyming sl. birdlime ‘time’.]
• flip someone the bird
  N. Amer. informal stick one's middle finger up at someone as a sign of contempt or anger.
• (strictly) for the birds
  informal not worthy of consideration.
• give someone the bird
  Brit. informal boo or jeer at someone.
• have a bird
  N. Amer. informal be shocked or agitated.