western diamondback rattlesnake, crotalus atrox, organ pipe cactus national monument, sonoran desert, arizona

reptile wildlife animal soil snake serpent rock western diamondback rattlesnake crotalus atrox organ pipe cactus national monument sonoran desert arizona ajo mountain drive early morning sun usa southern large north america united states species rattle black white bands scales pattern rocks shrubs camouflage head body long nature natural environment park southwest southwestern deserts native poison poisonous dangerous venom venomous bite dry arid predator ground