The largest land animals on Earth today are all herbivores, but this was also true during the age of the dinosaurs. In descending order, the 5 largest living herbivores are the African elephant, the African bush elephant, the Asian elephant, the white rhinoceros, and the hippopotamus. The only living animals which are larger in size than these creatures are whales. Whales are not herbivores, but being a herbivore within the ocean is actually quite uncommon. The only reason whales are able to become larger than the largest land-dwelling mammals is because of the way that the ocean displaces gravity, therefore providing resistance to the pull which would under normal circumstances cause whales to collapse under their own weight. The primary reason the largest land animals are herbivores is because of food resources. There are a staggering amount of plant resources made abundant for herbivores in comparison to the relatively small amount of protein rich resources available to carnivores. Plant resources are also quickly renewable unlike protein resources. Herbivores are apt to survive predation as they increase in size whilst carnivores actually become hindered as they increase in size due to the fact that they become slower and less agile making their ability to catch prey severely reduced
