Crevice Spiny Lizards are endemic to the Chihuahuan Deserts of NM, TX, and northern Mexico. Adults can reach lengths of 10+ inches, but most are smaller. They mainly eat insects and occasionally tender plant parts. They are found in rocky, semi-arid habitats. Individuals are cautious and will quickly dart into holes and crevices to escape predators. Although they look typically lizard colored (dull grey with a white and black collar), both males and females develop beautiful, bright markings along their throats and bellies during the breeding season. Lizards go through complex displays of push-ups and nods, lifting their underparts to flash the bright colors. After breeding, females retain the fertilized eggs inside their bodies and give birth to live young a few months later.