Report 12994: Man observes creature walking across road.

I was traveling southeast from crownpoint nm, on the eastern part of the Navajo Reservation. i was headed home as i was going through a small canyon (pass) in the head lights of the vehicle i observed a animal traveling east to west across the high way, it appears to about 6ft. tall and big, it was walking on two legs and went into a small gully i pulled the vehicle around and shine the light up the gully and i could not relocate the animal. due to the darkness and only seeing it through the head lights i could not make out the hair color it appeared dark. i know the differents between deer and other animals and it was not one of them, i could not explain what i've seen.