Omnivores are a polyphagous ("many foods") species that is a consumer of a variety of material as significant food sources in their natural diet. These foods may include plants or plant-equivalents, animals or animal-equivalents, algae or alga-equivalents and fungi or fungus-equivalents.

Omnivores often are opportunistic, general feeders with neither carnivore nor herbivore specializations for acquiring or processing food, and are capable of consuming and do consume both animal protein and vegetation. Many omnivores depend on a suitable mix of animal and plant food for long-term good health and reproduction.