Carnivores: These are the animals which obtain their food by eating other animals. Examples are lion, tiger, lizard, snake, etc.
Herbivores: Animals which eat only plants and plant products are called herbivores. Examples are cow, goat, rabbit, sheep, deer, elephant, etc.
Omnivores: Animals which eat both plants and animals are called omnivores. Examples are crow, bear, dog, rat, etc. Humans can also eat all types of substances, so they are also an example of omnivores.