The mighty Mastodon was a large mammal perhaps most widely known for its stunning recurring performance on Power Rangers.
As one of the larger roaming mammals at the time, the Mastodon spend most of its day browsing for food. This set them apart from most other mammals who were basically just bottom feeders who ate shitty ol' grass.
It's possible that they also lifted lesser mammals in order to maintain their cut physiques--which lends to the increasingly popular theory that the Mastodon would have been the perfect man for Snooki, had pickles existed during their era.
Humans and other predators hunted the Mastodon because god-damn, haters gonna hate. Also: who could resist that piece of ass?