on close inspection it appears that nectar-feeding birds such as sunbirds rely on the ants and other insects that they find in flowers, not for a richer supply of protein, but for essential nutrients such as vitamin b that are absent from nectar. similarly, monkeys of many species eat maggoty fruit, sometimes in clear preference to sound fruit. when to refer to such animals as omnivorous or otherwise, is a question of context and emphasis, rather than of definition.