Head to Storm Peaks, where http://www.wowhead.com/npc=29469 is located, these rhinos get caught by Proto Drakes and they will kill the rhinos in midair.
Just cast tame pet on a rhino, and hope it will get caught and dies.
It's actually just luck, but if it works, you can call your "dead" rhino!
It doesn't do anything interesting, though. Tested in a BG - it will get "ressed" too, if you get a ress from a spirit healer. Lol.