Hi Art, Hi Andy, This kind of seems like a private conversation, but may I butt in for a second? As far as species interbreeding, this can and does happen in areas of overlap. I have seen it occur among certain chiton species that were living on the limited environment of an old barge. Now as to whether the results were "mules", I have no idea.But I do know that this is a common phenomenon within the avian community, and new "species" which reproduce progeny with the same characteristics as the parents have developed in the wild. And where geographic separations in populations occur over long periods of time species modifications have been documented. Wouldn't it be the same for all living species? Patti Lounsbury in New Mexico ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com