Cheek-Pouches of the Macaque Monkey
The macaques, mandrills, mangabeys, and baboons, all have cheek pouches for food storage. They use the pouches while foraging in the same way that hamsters do.
The Anatomy of the Human Peritoneum and Abdominal Cavity, Considered from the Standpoint of Development and Comparative Anatomy. George S. Huntington, 1903.