An omnivore is an organism that can feed on both plant and animal sources.
Example; Dogs,Bears Humans: Humans have a wide range of diets, from completely herbivorous to almost entirely carnivorous, but most humans eat some amount of both meat and plants.
Pigs Pigs are often used to study human digestion because of how similar their gut is to ours. Pigs can eat a wide variety of plant an animal materials. Pigs have been known to eat carcasses as scavengers, but are rarely predators, unless they are digging up small insects.
Crows: Many large birds are scavengers, and will eat whatever they can find. Crows can subsist on stores of grain, small insects, and carrion.
Ants: Ants are some of the smallest omnivores. Ants typically harvest plant material as food, but will easily convert an intruder to the colony into dinner as well.
Badgers: Much like bears, badgers also hibernate, and eat a variety of plants, insects, and small animals to gain weight.
Chipmunks: Though consisting of a diet mostly of nuts, chipmunks will often eat a variety of animals, including insects, crabs, frogs, worms and bird eggs.
Mice: Mice are often opportunistic feeders, eating anything they can find.
Opossums: The only North American marsupial mammal, being an omnivore has allowed the opossum to spread from South America. The opossum occupies a similar niche to raccoons, subsisting on carrion and the left-overs from human civilization.
Chimpanzees: Chimpanzees have been found to hunt and eat small animals, in addition to their mainly plant-based diet.
Chickens: Chickens eat a variety of insects, but will also eat small rodents, other birds, and eggs. However, a chicken can also subsist only on grains and plant material.
Turtles: Many turtles, both aquatic and terrestrial will eat plants, fish, and insects, according to what they can catch.
Lizards: Although many lizards feed only on insects, many feed only on plants, and there are some that feed on both.