Some of these are pretty bad.

What birds spend all their time on their knees?

Birds of prey.

What do you call a very rude bird?

A mockingbird.

Where do birds meet for coffee?

In a nest-cafe.

What do you call a bunch of chickens playing hide-and-seek?

Fowl play.

What language do birds speak?

Pigeon English.

What do you give a sick bird?

Tweetment.

What do you get if you cross a parrot with a shark?

A bird that will talk you ear off.

What happened when the owl lost his voice?

He didn't give a hoot.

What do you get if you cross a parrot with a centipede?

A great walkie-talkie.