The most observed reptiles in the desert include: Mohave rattlesnake Crotalus scutulatus, twin-spotted rattlesnake Crotalus pricei, prairie rattlesnake Crotalus viridis, ridge-nosed rattlesnake Crotalus willardi, whip snake Masticophis flagellum, New Mexico whiptail Cnemidophorus neomexicanus, and red-spotted toad Bufo punctatus.