A hunter in Idaho has stumbled across a dreadful biological mystery – a mountain lion with a second set of fully-formed teeth and whiskers growing out the back of its head. Wildlife officials say they have never seen a deformity like this.
Idaho Fish and Game officials say the mountain lion was involved in an attack on a dog near Preston, Idaho (near the Utah border). It was killed by the hunter.
Scientists are unsure if the monstrous growth is remnant of a conjoined twin that died in the womb or a teratoma tumor, rare growths that have been known to grow teeth and hair.
Check out more pictures of the deformed mountain line in the pictorial gallery below.