why do humans need to eat many different kind of foods to get their vitamins etc but large animals like cows only need grass to survive?

Question

why do humans need to eat many different kind of foods to get their vitamins etc but large animals like cows only need grass to survive?

In: Biology

Answer 1

Wild deer sometimes eat dirt, well if they can they find a salt lick. But they still go looking for minerals not found in the plants they eat. They also occasionally munch baby birds. Possibly other small wildlife, but I know about the birds. It’s a bit like the way a dog or cat sometimes eats grass.