Quote:Able to reproduce means morn than could reproduce only under rare and unusually circumstances even if placed together. If require enough behavioral compatibility to do so with some frequency when possible. Behavioral compatibility is part of reproductive compatibility.
And obviously they managed that, Chuck. That's the whole point of the recent genome studies about HNS which have come out. But I don't think Darwin would have cared about anything except the biological ability to reproduce.
Horses and donkeys can breed but the offspring are infertile, generally. Same is true of ligers.... (lions and tigers). Grizzly bear/polar bear hybrids have been found in Alaska...unfortunately the shitheads up there tend to shoot them so who knows if they are "fertile" of not.