In zoology, a folivore's a herbivore that specializes in eating leaves. Mature leaves contain a high proportion of hard-to-digest cellulose and relatively little energy. For this reason folivorous animals tend to have long digestive tracts and slow metabolisms. Many enlist the help of symbiotic bacteria to release the nutrients in their diet. Folivory and flight It's been observed that folivory's extremely rare among flying animals. Morton (1978) attributed this to the fact that leaves are heavy… (More on Folivore)