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> The definition of species is related to genetics, not to behaviour.
I disagree.
By human intervention, you can cause all kinds of matings to occur that
would never, ever happen in nature. That does /not/ mean that all
animals are of the same species.
> The offspring must be fertile. Ligers and tigons aren't.
Apparently it was long thought that ligers and tiglons were infertile,
but apparently they have in a few rare cares produced long-lived offspring.
But in any case, yes, I agree that the offspring must be fertile.
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