sentient

 Birds

Moulting

Meadowlark

Black-browed albatross

Odd one out

Gentoo penguins

Mitred Parakeet

Two-banded plover

Silvery grebe

Upland geese

Rockhopper penguins

Black-browed albatros

Ural Owl

Stellar's sea eagles

Northern pintails

Red crowned cranes

Whooper swans