Is this your definition of a species (failure of reproduction)? If so, it contradicts your comment: And closely related spieces reproduction is ALWAYS sterile...
Fertile mules do exist.
Note that your definition would imply and tigers are the same species.
I didn't imply that..
I see.. Sooo.. If I git yer drift....
Jackalopes are possible then... or Bassagators..
Doberman Kittys might be useful too.. or Peregrine Finches.
You seem to be a believer.. I'm not..
I be a Agnosnievolusonist.. not really sure what happened, and not ready to commit for lack of concern. Thats a job for democrats. Which is producing proof that "GOD" did NOT grant inalienable human rights, in our Constitution.. And that privileges granted by government are better than god granted "rights".. inalienable or otherwise.. Attack the source of those rights and you attack those rights.. I'm not sure God granted them either but do enjoy them.. and will support "God" in what ever future support it gives..
In choosing myths.. I prefer "God" as opposed to some nebulous theory that says I'm no better than road kill, WALKING.. and IMPLYS I have no "rights" except the ones my MOB guarantees.. since democracy and democrats are FOR MOB rule(democracy)..
Call me stupid, please.. because I don't refuse myself that right with "others"... know what I mean ?..