lizard in petrified forest, arizona

aggressive agile ancient animal arid arizona bizarre blooded camouflage cold coldblooded collared colors desert desolation devil diversity dragon forest gray harmless head herpetology jaw lizard natural nature outdoor oviparous petrified poikilotherm reptile reptiles reptilia reptilian rock sand small spines spiny squamata stellion stone tail tetrapods vertebra vertebrate waste wild wildlife