Western lyre snake eating spiny lizard prey. Trimorphodon biscutatus biscutatus. Lizard: Sceloporous clarki. This secretive, nocturnal, cat-eyed species is rear-fanged and mildly venomous. Native to the western United States and northern Mexico. Sonoran Desert, Tucson Mountains, Tucson, Arizona, USA. Photographed under controlled conditions (Feeding sequence that includes UAZ-1783, capture and constriction; UAZ-1784, UAZ-1785, beginning to feed; and UAZ-1786, UAZ-1788, swallowing).