The Chicken is a domesticated fowl and a subspecies of the Red Junglefowl.
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Happy Feet Two
They appear to be roasted in Happy Feet Two when Sven climbs some boxes to see humans cooking, stuffing, and eating chicken in their mess hall, thinking that they might become food too, so he flies south to the Adélie Penguin colony. They appeared again in a flashback when the aliens that saved Lovelace and Sven arrives at Antarctica.