Speaking English Like A Native

this is phrase used to conceal the identity of someone who has told you something that was previously confidential or secret.

example:

1. a little bird told me, and you might as well stop asking because i’m not going to tell you who my little bird was.
2. i heard it from a little bird.
3. your little bird is nothing but a tattle tale.

this is and old saying that comes from the sport of bird hunting. when one bird is shot, the others fly away. it is another way saying that it is better to achieve one goal than try to do much and gain nothing,

example:

1. a bird in the hand is worth two in the bush.
2. let’s go for a bird in the hand and forget the rest.
3. he was never satisfied with a bird in the hand, and went on to become successful.