What's good for the goose is good for the gander

DUCK!!!! (lower your head)

Silly goose

Like a sitting duck

Waddle like a duck

Lucky duck!

A quack (bad doctor)

Get your ducks in a row

Goosed (pecked in the rear)

Don't get your feathers ruffled (any bird)

Let it roll like water on a duck's back

The goose that laid the golden egg

If it walks like a duck, quacks like a duck, looks like a duck, it must be a duck

Like a duck out of water

Like a duck takes to water

Loose as a goose

Wild goose chase

His goose was cooked  

Bottoms up!

Just Ducky

Take a gander--to have a look at something

Going quackers

Feather your nest

Quackerjacks