How are some of the largest land animals like Rhinos, Elephants and Giraffes are herbivores? How do they get so big from eating grass, don’t they ever get hungry?

Question

I don’t get how something so big just eats grass like a cow. If we eat vegetables all day we won’t get fat or super big so how are they able to do it? I feel like eating grass all day is not very filling.

In: Biology

Answer 1

They eat an absolute massive amount of plants. A large cow eats 60 pounds of hay (dried grasses) per day, and much more fresh grass (because they eat more water weight). A man who is 1/10th the cows size would get about 4 days worth of calories from an proportional amount (6 lbs) of dried foods like (fruit or meat).