>horses can breed with donkeys
a lot of the time it doesn’t make an offspring, there are even populations of horses and donkeys that cannot interbreed. the mule, is a sterile animal.
>goats can mate with sheep
The offspring of a sheep–goat pairing is generally stillborn. Despite widespread shared pasturing of goats and sheep, hybrids are very rare, indicating the genetic distance between the two species
given the genetic abnormalities that could happen it is morally unethical to even try for human hybrids on the off chance conception was even plausible.
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