Frugivores
Frugivores survive mainly by eating fruit. Many frugivores are a part of a symbiotic relationship with plants, because they disperse seeds in their waste after digestion. Animals that are frugivores include many kinds of birds, monkeys, and the ring-tailed lemur.
Folivores
Folivores are leaf eaters. Mammal folivores tend to contain flat teeth and molars for chewing. Koalas, snails, and sloths are all folivores. Because leaves contain very little energy but are plentiful, folivores need to eat a lot of leaves. They also have a slow metabolism and need to make the most out of every little bit of energy they can extract out of leaves.
Nectarivores
Nectarivores eat nectar produced by flowers. Nectar is rich in sugar and contains a lot of energy. Examples of nectarivores are honey possums and hummingbirds as well as other birds and insects.
Granivores
Granivores are herbivores who eat mainly seeds. These include many species of birds and rodents, and, specifically, Hawaiian honeycreepers. Granivores also may have symbiotic relationships with plants, as they may disperse seeds in their waste similar to frugivores.
Palynivores
Palynivores survive by eating pollen. Bees are the most famous palynivores. They use pollen to create honey, and also aid plants by cross pollinating flowers.
Mucivores
Mucivores are insects who survive by eating the sap or fluids of plants. An example of mucivores are aphids. They are a nuisance to gardeners.
Xylophages
Xylophages eat wood to survive. The most common type of xylophages are termites.