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Q&A Preventing inter-species breeding in humanoids?

In my setting, every humanoid creature in our worlds mythology is part of a different species that branched off from humans millions of years ago. I'm trying to devise a way to prevent crossbreedin...

6 answers  ·  posted 7y ago by Jordan Williams‭  ·  last activity 7y ago by Jordan Williams‭

Question biology reality-check humanoid