A chipmunk with bulging cheek pouches.
cheek pouch definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
a pouchlike structure in the cheek of certain rodents, monkeys, etc., used for holding food
cheek pouch definition by American Heritage Dictionary
A pocketlike fold of skin in the cheeks of various animals, such as squirrels, gophers, and monkeys, that functions as a means of carrying food.