In mountain gorillas, which feed mainly on leaves, foraging behavior is mostly observed in the early morning and late afternoon, and they rest around noon for digestion. Contrary to this, gibbons and chimpanzees, both of which are fruit-eaters, do not have such an activity rhythm, and, as fruit has a high digestibility, foraging can be similarly observed during most of daytime.

■References (Books, papers, Web articles, etc.)
『サルはなにを食べてヒトになったか―食の進化論』　　山極寿一　（女子栄養大学出版部、1994）

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