Chicken

Chicken is a bird that appears in some games and instances.

Angry Birds Classic
They are made of white wood and have red combs and yellow beaks.

Angry Birds Friends!
They are small white birds with brown eyebags, small wings yellow beak and feet and red combs. They use the same design as the small Caged Birds From Angry Birds Rio.

Angry Birds Classic
They appear in various levels of Piggy Farm and are made of wood, they appear in the structures but aren't special objects or animal, just structures.

Angry Birds Friends!
They appeared in the Kentucky Free Chicken Tournament where they act similar to how the Caged Birds and animals in the game but they doesn't need a cage and go to the birds' area when freed, they give 5000 points.