We already have Wolf, Spider, Dog, Cat, Bird, Crocodile(?), Rat, Snake, Cow, Fish (?), Horse (Centaur?), Mole(Rammus?), Dragon, Scorpion, Bear, Monkey and whatever the hell Kha Zix is, what other animal do we need?
I personally think we need an awesome turtle, not the "Udyr" kinda turtle, but a pure tank turtle, one capable of taking ANY damage and provide some utility.