Mammalian Hybrids
macroevolution.net
macroevolution.net
https://www.google.com/search?q=jackalope+taxidermy&tbm=isch
https://www.google.com/search?q=rabbit+papillomavirus&tbm=is...
I do wonder how much research goes into this topic. The common knowledge seems to all boil down to a single sentence: Only same-species couples can reproduce, except a few cases of same-genus couples, but their offspring is infertile. But how much of this is theoretical, and how much is a result of experimentation (not necessarily full blown Moreau experiments - just creating a viable zygote)? If there's little experimentation, is it because we're just so confident in the theory, or is it because of morality or taboo?
This “definition” can so easily be reduced to the absurd by simply going back in time in steps to the common ancestor of, say, humans and dogs, and then going up again, to then by transitivity prove that human beings and dogs are the same species, yet they cannot reproduce together.
The classification of “species” is entirely arbitrary, any “definition” of it offered is shallow and pædantic.