TIL about ring species, when a bunch of groups who live in a circle or ring can crossbreed with another group next to them, except for the two end points of the ring, whose species cannot cross breed due to being too distant.

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

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  1. I had read about this but didn’t know the term was ring species. There are real life examples of beetles (and others) where the starting population migrates beyond an uninhabitable feature such as a lake or desert, and evolution does it’s thing given a long enough passage of time and environmental variations. So by the time the descendants of the common ancestor reach the far end of that uninhabitable feature, each group from either side can not or will not mate with their rediscovered biologically distant “cousins”. Think East side vs West side.

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