Also potentially painful, deadly deformities could also be yielded. Also, if one species is adapted to a particular location, even if the overall environment is 'similar' and this species is then crossed with another, then the poor animal might have the mind to behave and respond like one species, but be unable to due to the physical nature of it's other parent. You only have to look at some of the 'jungle corn snakes' to see this, totally disgusting cross in my opinion, so many get damage to their noses because they want to burrow like one parent, but has the snout of the other.