EXPLANATION: Mythological chimeras consist of 2 or more types of animal. Since the animal pictured here consists of one or at most 2 animals (both asses) it can't be a classic chimera ;)
Yeah, it almost looks like the head is on the wrong end. Or, maybe it is that mythological two horse's ass Ass?
Mac, it's not a horse - it's a donkey body. Since it's all technically consistent with ass parts the most exotic thing it could be is a genetic chimera ;)