This page will eventually have info on species, equine and non-equine, found in the world of MLP.
Equine species will include: Earth Ponies, Unicorns, Pegasus Ponies, Alicorns, Sea Ponies, Flutter Ponies, Zebras, Wingers, Mermaids/Mermares, Breezies, Donkeys and Mules, Changelings, Crystal Ponies, Umbrum, Hippogriffs, Kirin, Abada, Kelpies and Auroricorns.
Non-equine species will include: Dragons, Pony Friends (Camels, Giraffes, Lions, Moose, Dinosaurs, Elephants, Llamas, Pandas, Sheep, Cows and Kangaroos from G1, as well as Tigers, Peacocks and Bats from G4, and Snow Leopards from G5. Essentially, animals with cutie marks that aren't otherwise equine), Yaks, Griffins and Deer.
There will also be a "Weird Cases" section including MLP 'n Friends' Grey Valley horses, other realistic horses from G1, MLP Tales' Clydesdales, and G4's Goats and Bat Ponies.