In primates, insect-eaters have a simple digestive tract and sharp front teeth. Fruit eaters have a small stomach and a simple intestine. In contrast, leaf-eaters, such as colobuses have stomachs divided into four parts like ungulates, in two of which bacteria live and degrade the cellulose and poisons of leaves.
■References (Books, papers, Web articles, etc.)
How Humans Evolved (Eighth Edition) Robert Boyd Joan B. Silk. W. W. Norton & Company; Eighth edition (December 1, 2017)
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