Herbivores:
* Domestic Animals: Cows, horses, pigs, chickens, sheep, goats, rabbits, ducks, geese
* Wild Animals: Deer, elk, squirrels, chipmunks, mice, rats, birds (like sparrows, pigeons, and doves), some species of fish
Omnivores:
* Domestic Animals: Dogs, cats, pigs, chickens
* Wild Animals: Bears, raccoons, opossums, foxes, squirrels, rats, many bird species
Insects:
* Grain Weevils: These tiny beetles are notorious for infesting stored grains.
* Other Insects: Some species of moths, flies, and beetles can also feed on grains.
It's important to note that not all animals of a particular species will eat grains. For example, some chickens are raised on a diet of grain, while others may eat more insects.