the.com/folivore

An animal that chose the diet with the least calories and the most chewing.

means An animal that feeds mainly on leaves, a diet so fibrous and nutrient-poor that it usually demands a slow gut, a big gut, or both.

from Built from Latin folium, 'leaf' (the same root that gives us foliage), fused with -vorus, 'devouring,' from vorare, 'to swallow whole.' It's a 19th/20th-century scientific coinage, assembled the same way as carnivore and herbivore — Latin parts bolted together by naturalists who needed a tidy label for leaf-eaters specifically, not just plant-eaters in general.

energy budget
leaves are so low-cal, sloths barely move
gut hack
many ferment leaves in oversized guts like cows
detox skill
must neutralize plant toxins leaves evolved as defense
famous folivore
koalas eat eucalyptus other animals find poisonous
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