Like a Duck to Water

Free as a Bird

An Albatross Around the Neck

Meaning: a heavy burden or difficult obstacle

Dead as a Dodo

Meaning: extinct, no longer existing

Graceful as a Swan

Proud as a Peacock

As Scarce as Hen's Teeth

Meaning: limited or nonexistent

As the Crow Flies

Meaning: a straight-line path, the most direct route

Birds of a Feather Flock Together

Eagle Eye

The Early Bird Catches the Worm

Eat Like a Bird

Feather Your Nest

Meaning: to pad financial gain or collect favors from others

Night Owl

Ugly Duckling

Meaning: one who is unattractive or out of place, though who becomes more beautiful or desirable as they mature

Take Someone Under Your Wing

Meaning: to offer protective guidance or mentoring

Like Water Off a Duck's Back

Crazy as a Loon

Meaning: insane or nutty