Board Thread:General Discussion/@comment-12776-20141204051237/@comment-12776-20141204080806

Because mutants are subspecies, but they aren't full subspecies by themselves. The big different is here.

''When a monster of a mutated race reproduces, the children born won't be monsters of the same mutational variant, but children of the original race. For example, if a hobgoblin has children, goblins will be born. If an alp has children, succubi will be born.''

and

''However, when monsters of mutated races reproduce, the chance for a mutant to be born is slightly higher than normal. After a very long time, it is eventually possible for them to become an independent race of monsters.''

So basically, mutants aren't full race, yet.