This creature is called a 'draconequus'. He has the head of a pony, and a body made up of all sorts of things.
~ Cheerilee describing Discord

Hybrids are heroes that are a mixture of one or more different species - they can be humanlike in appearance or totally alien but should not be confused with naturally occuring humanoid animals (who are more accurately described as Anthropomorphic). Furthermore, it's highly possible that hybrids are equally powerful than either race.