Comment Re:Were Denisovans really a DIFFERENT SPECIES? (Score 2) 133
That's an outdated definition. Species is flexible in that regards.
Species A can breed with Species B and Species B can breed with Species C but species A can't breed with Species C. (and by breed, I mean produce fertile offspring). Rut Roh.
Remember that species is also a convenient moniker for what something is/was at a particular moment in time. Given enough time and isolation, perhaps our different human races could diverge enough to have similar issues with breeding. For Denisovans, they remained isolated enough to condense their gene pool (and add their own mutations) to be considered a distinct species, but still capable of interbreeding back into the main branch, so to speak. Hrm, there's gotta be a git analogy here that is too early for me to formulate.