The ponies eat a largely vegetarian diet, and I am currently in a small town which brings to mind a medieval village. There are at least five kinds of ponies that I have interacted with, the normal ponies, zebras, those with wings (pegasi), those with a horn (unicorns), and those with both wings and horns, such as their Queen: Princess Celestia and another who if I understand correctly serves as Queen at night, Princess Luna. All of the adult ponies I have seen thus far have a mark on their flanks which appears to be unique and symbolic: Lyra has a lyre as her mark; those marks are apparently granted when a pony reaches maturity.