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[–] ArmourFou 1 point -1 points (+0|-1) ago 

Distinctly different species can't produce fertile offspring together.

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[–] tastywhitemeat ago 

It has been determined that interbreeding depends on how long ago the two species branched from a common ancestor, not how different they are, although obviously if they branched more recently they will typically be more similar. This is why certain hominid species could interbreed, for example.