This 4 April 2020 video from the USA says about itself:
One of the rarest rattlesnakes of Arizona is the Ridge-nosed rattlesnake (Crotalus willardi). Rattlesnakes are venomous pit vipers and in Arizona, there is the highest diversity of the whole USA. This species lives in the high mountains, in canyons and montane forests. Living Zoology went to Arizona to film a snake documentary about the beauty of these reptiles.