I've been living here in Las Vegas for 30 yrs., and my house is on the edge of town. My son catches lizards every weekend in the desert behind us...they are easy to find among the rocks. Snakes are hard, however. I've seen one Mojave Green, one long skinny snake of some kind, and heard the buzz of one rattler. I also moved a huge angry gila monster off the road at Lake Mead once... he really tore up my blanket. "Endangered" desert tortoises are very common reptiles. At sundown on the Northwest end of the valley you can find tarantulas on the road, and of course we brush scorpions off our steps fairly often. Last month a juvenile hawk found his way into our open garage, but escaped unharmed. The coyotes come after midnight looking for water from sprinklers. Good luck!