Crossbred-Species

Any crossbreed is generally seen as against natural order of things, thus any offspring resulting from parents of two different races is seen as an abomination and best off dead.. course not everyone will feel that way but the large majority of the 'pure' lines/clans will try to kill such half/cross breeds on sight or when they're born and then punish the parents for it.

This is largely the result of past experience showing that most crossbreeding will end up either hurting or killing the mother trying to give birth to the child or the child itself being born into a miserable life due to birth defects or certain abilities gained from each race conflicting and making the child's (and likely the parents) life hell.

Thus even those there are some successful cross/half breeds out there, it is largely taboo to all the pure races to breed with a race that is not your own. Those who believe in this the most will even go as far to kill the crossbreeds when they come across them, no matter their age. If they find the parent's of such a child, it is very possible the parent's will be punished as well.