Isn’t what makes a new species the fact that they can no longer mate with their ancestral species?
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they are close enough in evolutino terms(they sit at the same table ” panthera”) that they can produce offspring but not close enough that said offspring is fertile.
that’s the issue with ligers, yeah they are possible, but they cant reproduce. if they could reproduce, byt the currently accepted definition they would be their own unique species.
its no different from another common crossdbreed, mules: possible but sterile.
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