birds of a feather

birds and bees

Informal education about sex.

birds of a feather flock together

People of similar character, background or taste tend to congregate or associate with one another; it is easier to establish friendships with people that one has a lot in common with.

charm the birds from the trees

To behave in a very charming manner.

feather in one's cap

An accomplishment; particularly one that is flaunted or boasted of.

feather one's nest

To achieve benefits, especially financial ones, by taking advantage of the opportunities with which one is presented; to amass a comfortable amount of personal wealth; especially, to do so to a degree that involves venality.

feed two birds with one scone

Synonym of kill two birds with one stone.

fine feathers make fine birds

Something that appears beautiful or good is by definition beautiful or good.

for the birds

Not deserving serious consideration; unimportant; useless, worthless.