* Mammals: Humans, pigs, bears, raccoons, squirrels, rats, opossums, foxes, dogs, and many primates.
* Birds: Chickens, crows, ravens, robins, ostriches, and many others.
* Fish: Piranhas, catfish, and some species of sharks.
* Reptiles: Some species of turtles and lizards.
* Insects: Some species of ants, cockroaches, and beetles.
It's important to note that not all omnivores eat the same ratio of meat to plants. For example, humans can survive on a primarily plant-based diet, while bears are more carnivorous.