Such as chimpanzees branching into common chimpanzees and bonobos, as explained in this video
Presumably it’s not that some chimpanzees just suddenly started giving birth to bonobos overnight…?
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The mechanism is a mutation that proliferates in one population and not in another.
Chimpanzees wouldn’t have given birth to a different species, but one mutation proliferated in the first generation and the two groups never remerged.
Each population would then undergo subsequent mutations, embracing some and rejecting others, until the compound effect of them is such that they could no longer interbreed.
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