Abstract
Most primates are nearly or exclusively herbivores, but their digestive tract does not show the high degree of morphological specialization seen in many other herbivores. Even some of the smallest primates, which until recently were believed to be carnivorous, subsist on plant food. In humans the large intestine is relatively less voluminous than in apes (which are predominently plant eaters), but nevertheless, humans are surprisingly effective at digesting food cellulose.

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