"You are assumeing they don't share a common ancestor. Remember someone posted right here on this thread something about frogs that have common ancestors and yet are no longer fertile. You don't beleive it, but all ducks, if they could, can trace their ancestry back to two created by the God of the Bible ducks."
Nope. Not assuming that at all. I was just pointing out the inconsistency in thinking that Mallards and Blacks share a common ancestor whereas Mallards and Teal do not. The inconsistency springs directly from the definition of species that TS gave in an earlier post.
