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A comment on We don't know which species should be classed as 'human'. Parent comment

Re:We don't know which species should be classed as 'human' by Retric on Monday January 11, 2016 @11:27AM (#10881371)
The natural question is then what about Ring species? With populations A, B, and C. A-B can breed, B-C can breed, but A-C can't.

https://en.wikipedia.org/wiki/Ring_species

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Re:We don't know which species should be classed as 'human' by defiblep on Monday January 11, 2016 @12:35PM (#10881798)
As a thought experiment, if you imagine ring species in time almost anything can "breed" with almost anything else.

Eg each human can breed with a human in the previous generation. Each chimp can breed with a chimp in the previous generation. Right back to their common ancestor.

As long as there's a common ancestor, there should be a viable chain to be followed in most cases.

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