Hello, Thinking about the last thread on species, subspecies et al, I remembered that even genetics must be handled with care: some populations with apparently great genetics differences (great to some level, of course) could be able to hybridize, while a little cluster of gens may however prevent that in others. And this brought to my memory the good old Linnean definition for species, and I would ask you if anybody knows something about if this has been checked for some of the usual conflictive species. Of course I know that in most cases this is not easy, but sometimes with well known species (let's say Mitylus edulis vs Mitylus galloprovincialis -or M. e. galloprovincialis, depending on the author-) it could be possible to see if they can hybridize and to what extent, and so resolve the conflict. Do you know if this has been done with any species? Best regards, Alfonso Pina Malaga Spain P.S. If any of you are thinking to apply this to genus Homo, I must warn you that it has been completely checked already and it works fine...