User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-217.129.17.186-20121204200248/@comment-192.26.140.217-20121205010329

So,  what you are trying to say is that their is on the Ratian ,but the color(or type) of rathian is based on recessive genes(the black ian being the least common gene).

Or are like dogs in which there are many different kinds of breeds, but are still able to breed  amongst different breeds since they are still the same species.