A Blacktailed Rattlesnake hiding deep in a cave on an extremely hot day. During the heat of summer, rattlesnakes like this one may stay hidden away from lethal temperatures, staying in one spot or coming just outside the entrance after dark.
Coachwhips are out and about on even the hottest days, rarely active at night. But they can still be found where they sleep, which is often up in trees high off the ground. We spotted this one doing just that just above eye level on a late night hike. These long, slender snakes are great climbers, and this is a reasonably safe spot for such an animal to evade predators and get off the hot ground.
A Gila Monster I followed to a nest of cottontails. It took a while, but it ate all three of them that were in there. Amazingly, they all fit, and the lizard ambled off to rest under an overhanging root in the drainage. It was a good example of how the venom of Gila Monsters is not necessary for predation, as the venom played no apparent role in the capture or consumption of its prey.
A Southwestern Speckled Rattlesnake in ambush on a humid night a couple of years back. Like many other desert reptiles, the monsoon and period after are the most active times of year. Humid air and cooler, stable temperatures make for safer activity, and a lot has to be done in a relatively short amount of time.
Southwestern Speckled Rattlesnake (Crotalus pyrrhus)
A Southwestern Speckled Rattlesnake rests in a rocky retreat, waiting for dark. Like other rattlesnake species in the Phoenix area, once temperatures stabilize in the triple digits, their activity becomes mostly nocturnal. The late afternoon is a good time to wait for a lizard or bird to make a mistake, in the meantime.
A Southwestern Speckled Rattlesnake resting in the shade outside its summer aestivation den. It’s one of a handful that gather here each year to hide from the heat and gestate.
Western Diamondback Rattlesnakes in the Phoenix area aren’t all grey. Some can be reddish or have hints of orange, and some rich brown tones like this one.
A Western Diamondback Rattlesnake basking in partial cover. This is how rattlesnakes and other reptiles typically thermoregulate. Filtered light and conduction from nearby surfaces and substrate can help them tune in on the right temperatures to a fine degree, all while avoiding detection by predators and prey. This is also a reminder of why it’s best to stay on established trails and keep dogs on leash when hiking in the spring.
A Sonoran Desert Tortoise cruising around near one of its burrows. These animals dig out and widen natural caves in caliche or under boulders that they will use for a lifetime.
These are protected by law … but did you know you can adopt one as a family pet, for free? If you have a backyard, they are so fun. Here’s how you can adopt a Sonoran Desert Tortoise from the AZGFD: https://www.azgfd.com/wildlife-conservation/living-with-wildlife/wildlife-care-center/tortoise-adoption-information/
A Southwestern Speckled Rattlesnake emerges from its aestivation den for a short time to drink rainwater from its scales. In a rare pre-monsoon summer rain, every drop is needed. Hydrophobic keeled scales collect rain droplets, which the snake drinks over time.
