(via TYWKIWDBI (“Tai-Wiki-Widbee”): Cheek pouches of the macaque)
“They use the pouches while foraging in the same way that hamsters do.”
For reasons I can’t quite comprehend, this illustration comes from a medical textbook entitled “The Anatomy of the Human Peritoneum and Abdominal Cavity, Considered from the Standpoint of Development and Comparative Anatomy,” by George S. Huntington, 1903.