Reference: 99 Title: Comparative Digestive Anatomy of Humans and Apes Summary: The colon in apes makes up about 50% of gut volume, reflecting their dietary need for fermenting fibrous plants, unlike humans at less than 20%. URL: https://www.researchgate.net/figure/Relative-volumes-of-the-stomach-small-intestine-cecum-and-colon-in-modern-humans-and_fig2_272419339