Washington County Rattlesnakes

Washington County Rattlesnakes: Great Basin Rattler Courtesy & Copyright Marshall Topham, Photographer
Great Basin Rattler, Crotalus lutosus
Courtesy & Copyright Marshall Topham, Photographer
I was in the process of taking a video of a Gila Monster in Washington County’s Red Cliffs Desert Reserve. It was walking toward me and backed me into a Creosote Bush. That’s when I heard the buzz. It sounded like I had alarmed a rattlesnake, but I had been fooled before by a bull snake vibrating its tail in dry Leaf’s. It turns out it was indeed a Great Basin Rattlesnake coiled under the creosote and warning me to keep my distance. Washington County boasts 4 species of rattlesnakes, more than any other county in the state. While Great Basin Rattlers and Sidewinders are by far the most common, Mojave and Speckled Rattlesnakes can be found on the slopes of the Beaver Dam wash.

Sidewinder Courtesy & Copyright Marshall Topham, Photographer
Sidewinder, Crotalus cerastes
Courtesy & Copyright Marshall Topham, Photographer

Speckled Rattler Courtesy & Copyright Marshall Topham, Photographer Speckled Rattler, Crotalus mitchellii
Courtesy & Copyright Marshall Topham, Photographer

Mojave Rattler Courtesy & Copyright Marshall Topham, Photographer Mojave Rattler, Crotalus scutulatus
Courtesy & Copyright Marshall Topham, Photographer

The motion of Sidewinders is fascinating as they undulate across the desert sand, keeping a portion of its under-belly off the heated sand at all times to reduce overheating. These small (2 ft. or less) snakes have a horn over each eye. They are often overlooked because of their reduced size and reluctance to go in motion. Like most rattlers, they are primarily nocturnal in summer, but crepuscular during cooler seasons. They often bury themselves in sand, exposing only their eyes and horns. This behavior effectively hides them from predators and allows them to ambush prey such as lizards and birds.

Although all local rattlesnakes are well camouflaged, none measures up to the standard of the Speckled Rattlesnake. They seem to be nearly invisible on the basalt rocks where they reside. Out with a group of university students one day on the Beaver Dam Slope, I encountered a Speckled Rattlesnake. I probably wouldn’t have noticed it if I hadn’t watched it coil into a defensive posture. I called students over to observe it as it remained coiled and very still. It was entertaining to watch their reactions as one by one they were able to distinguish it from the rock with a look of excitement and disbelief.

All rattlesnakes are venomous and potentially lethal to some degree. Their venom generally contains hemotoxins which cause blood and tissue damage. The Mojave Rattler sometimes referred to as Green Rattlers, lead the way in this category, their venom contains nerve damaging neurotoxin. Envenomation by this specie is much more concerning as it can cause paralysis. It frequently causes Permanent numbness at the site of the bite.

Getting bitten by a rattlesnake can be a serious medical event but depending on the species, between 25% and 50% of Rattlesnake bites are “dry bites” meaning no venom is injected. If properly treated, within an hour or two, the outlook for recovery from envenomation usually very good. In fact, in North America, over 99% of people who receive prompt hospital treatment with antivenom survive. Over the years, many first aid measures for snakebite have been discredited, some even made the situation worse. It is best to keep the victim calm and still, immobilizing the bitten potion of the body if possible and keep it at roughly heart level as you calmly get to a medical facility.

All rattlesnakes are ovoviviparous, females produce fertile eggs but keep them inside their body until they hatch, so the young emerge alive. This is a great survival strategy in a desert environment where Gila Monsters and an army of other egg devouring creatures reside. Baby rattlesnakes feed on insects and small lizards until they become large enough to seek out warm blooded rodents. All rattlers are pit-vipers. A heat sensory pit is located between the eye and nostril on each side of a rattlesnake’s head. These pits detect infrared radiation (heat) from warm-blooded prey, they are so sensitive they can detect the heat left in rodent tracks. This adaptation is essential for nocturnal or low-light hunting.

Rattlesnakes discern their environment through a reptilian sense of smell. Extending their forked tongues, they collect molecules from the air and transfer them back into their mouths. There they are inserted into two A pair of organs known as “Jacob’s organs”. These organs interpret the molecules as a sense of smell and taste.

Rattlesnakes are marvelous creatures important for maintaining balance in ecosystems. Though feared by many, it is always a red-letter day for me when I have a chance encounter with a rattlesnake in my desert wanderings.

I’m professor Marshall Topham and I’m wild about Utah and its diverse rattlesnake fauna.

Credits:

Images Courtesy & Copyright Marshall Topham, Photographer
Featured Audio: Courtesy & © Friend Weller, https://www.upr.org/people/friend-wellerCourtesy & Copyright © Anderson, Howe, Wakeman
Text: Marshall Topham, https://ees.utahtech.edu/faculty-staff/
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah pieces by Marshall Topham https://wildaboututah.org/author/marshall-topham/

Utah Vipers, Fieldguide, Utah Division of Wildlife Resources, Utah Department of Natural Resources, State of Utah, https://fieldguide.wildlife.utah.gov/?family=viperidae

What to know about rattlesnakes in Utah and how to stay safe, Utah Division of Wildlife Resources, Utah Department of Natural Resources, State of Utah, April 8, 2025, https://wildlife.utah.gov/news/utah-wildlife-news/2094-what-to-know-about-rattlesnakes-and-how-to-stay-safe.html

Wild About Monsters

Wild About Monsters: Gila Monster Sunning, Courtesy & Copyright Marshall Topham, Photographer
Gila Monster Sunning
Courtesy & Copyright Marshall Topham, Photographer
Gila Monster Sensing with Tongue 
Courtesy & Copyright Marshall Topham, Photographer
Gila Monster Sensing with Tongue
Courtesy & Copyright Marshall Topham, Photographer

Wild About Monsters: Gila Monster at Den, Courtesy & Copyright Marshall Topham, Photographer Gila Monster at Den
Courtesy & Copyright Marshall Topham, Photographer

Wild About Monsters: Gila Monster Under Sage, Courtesy & Copyright Marshall Topham, Photographer Gila Monster Under Sage
Courtesy & Copyright Marshall Topham, Photographer

Wild About Monsters: Gila Monster Up to Size, Courtesy & Copyright Marshall Topham, Photographer Gila Monster Up to Size
Courtesy & Copyright Marshall Topham, Photographer

The excitement in her voice could not be more obvious as I answered her call. “Dad, there’s a Gila Monster walking down the middle of my jogging trail right now”. She was only a few minutes away so I ask her to follow it until I could get there. I arrived in time to film it wading through the desert grasses as it made its way back to its den. It’s always a good day when you see a Gila Monster in the wild. Monster sightings are not common in the Southwest corner of Utah even though they are quite abundant in this portion of the Mojave Desert. There’s a reason encounters with these beaded citizens of the desert are uncommon. They can spend more than 90% of their lives underground. Their activity is mostly limited to a few weeks in early Spring, and they generally emerge to forage in late evening, returning to their dens at dawn. Because of their exceptionally slow metabolism, they can survive on as few as three or four large meals a year. Those meals converted into fat, stored primarily in their tails, allows them to spend 10- or 11-months estivating (hibernating) out of sight, in their dens.

Despite their fierce reputation Gila Monsters are shy nonthreatening creatures. I have had them walk across my sandal clad feet on more than one occasion. If hassled these monsters will open their mouth and hiss loudly as a warning, but to get bitten by one would require handling it. They have venom, but lack a mechanism to inject it, so they must flood their mouth with the venom, filling grooved teeth by capillary attraction. They then must chew it into their prey. A Gila Monster bit should receive medical attention, but despite the legends we have all heard to the contrary, there is no reputable record of human death associated with Gila Monster envenomation. To the contrary, the saliva of Gila Monsters contains a compound called exendin-4, which has been synthesized into a drug used successfully to treat type 2 diabetes. This is a prime example of how the study of wildlife can lead to significant contributions to human wellbeing. It underscores the need to protect and preserve wildlife of all kinds. The Gila Monster is the official Utah state reptile, and they enjoy legal protection here and, in every state, where they occur. (CA, NV, UT, NM & AZ)

Several years ago, I had the rare opportunity of filming a Gila Monster excavate and consume four tortoise eggs from the apron of a tortoise den. The entire time a female tortoise stood inches away and observed the carnage without moving a muscle. I found myself wishing I knew how to communicate with tortoises so I could scream out “good grief mother, do something to protect your young”. Times like this create a moral dilemma. Do I intervein in this situation or let nature take its course. On this day I chose the latter.

I’m Professor Marshall Topham and I’m wild about Utah’s Gila Monsters

Credits:

Images Courtesy & Copyright
Featured Audio: Courtesy & © Friend Weller, https://www.upr.org/people/friend-wellerCourtesy & Copyright © Anderson, Howe, Wakeman
Text: Marshall Topham, https://ees.utahtech.edu/faculty-staff/
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah pieces by Marshall Topham https://wildaboututah.org/author/marshall-topham/

Gila Monster, Fieldbook of Utah Species, Utah Division of Wildlife Services, Utah Department of Natural Resources, https://fieldguide.wildlife.utah.gov/?species=heloderma%20suspectum

Jolley, Faith Heaton, A rare sighting of the elusive Gila monster, Wildlife Blog, Utah Division of Wildlife Services, Utah Department of Natural Resources, March 28, 2019 https://wildlife.utah.gov/news/wildlife-blog/580-a-rare-sighting-of-the-elusive-gila-monster.html

Red Cliffs Desert Reserve, Washington County & US Bureau of Land Management, http://www.redcliffsdesertreserve.com/

The Unique Biodiversity of Washington County

The Colorado Plateau Courtesy & Copyright Marshall Topham, Photographer
The Colorado Plateau
Courtesy & Copyright Marshall Topham, Photographer

The Great Basin Courtesy & Copyright Marshall Topham, Photographer The Great Basin
Courtesy & Copyright Marshall Topham, Photographer

Mojave Desert with Joshua Trees Courtesy & Copyright Marshall Topham, Photographer Mojave Desert with Joshua Trees
Courtesy & Copyright Marshall Topham, Photographer

Mojave Desert Courtesy & Copyright Marshall Topham, Photographer Mojave Desert
Courtesy & Copyright Marshall Topham, Photographer

Mojave Desert Tortoises Courtesy & Copyright Marshall Topham, Photographer Mojave Desert Tortoises
Courtesy & Copyright Marshall Topham, Photographer

Mojave Desert Tortoise Courtesy & Copyright Marshall Topham, Photographer Mojave Desert Tortoise
Courtesy & Copyright Marshall Topham, Photographer

Mojave Desert Tortoise in a Burrow Courtesy & Copyright Marshall Topham, Photographer Mojave Desert Tortoise in a Burrow
Courtesy & Copyright Marshall Topham, Photographer

For 44 years I have spent considerable time in the company of the desert creatures that reside outside my home in St. George Utah. That number doesn’t include my frequent visits to this area as a young man growing up in Iron County. Back then I did not appreciate the uniqueness of the environment I was invading. I do now. Washington County is an area of unusual biodiversity. An impressive variety of plants and animals call Utah’s Dixie home. Over 100 species of plants and animals found here don’t exist anywhere else in Utah. This extraordinary biodiversity is the result of several factors working together to create an environment that is uniquely its own. The biologically diverse environment of Washington County can’t be found anywhere else on Earth.

Today on the trail, I pondered the reason for such incredible biodiversity I was experiencing. Three large geophysical features collide and overlap here. The Great Basin Desert invades from the North, and the Mojave Desert from the South. The Colorado Plateau, a semi-desert pushes in from the East. Each of these deserts bring with them their own unique complement of plants and animals, making Washington County a mixing pot of biodiversity. In addition to the merging of these three deserts, the incredible local topography plays a role in the diversity of life here as well. Washington county elevation ranges from 1,800 to 10,365 feet above sea level creating a number of different life zones influenced by elevation change. Erosion has also been a contributing factor by created mesas and canyons that provide additional habitat diversity.

I marvel at this environment as I stand in one place and see around me plants that originated in each of these very different desert environments. This same experience is reflected in the wildlife I encounter as I traverse the trails in the Red Cliffs Desert Reserve. Today I encountered juvenile and adult Chuckwallas, sunning on sandstone outcrops or aggressively dismembering a Desert Marigold plant to feast on its blossoms. Tiger Whiptail Lizards dash back and forth across the trail in front of me, as Side-blotched Lizards casually watch me pass by from the edge of the trail. At one point, I had to alter my path a little to avoid a Desert Horned Lizard lying motionless in the trail. Intentionally watching carefully off trail, I observe the occasional Leopard Lizard in the sand or a Desert Spiney Lizard atop a rock. Today was a good day for Mojave Desert Tortoises, as I observed three along my route. All were foraging not far from the trail. Today was a great day to be in the desert, but I will be back again tomorrow. The desert is an incredible therapist. And the price of therapy is extremely reasonable. Who wouldn’t be wild about that?

I’m Professor Marshall Topham and I’m Wild About Utah.

Credits:

Images Courtesy & Copyright
Courtesy & © Friend Weller, https://www.upr.org/people/friend-wellerCourtesy & Copyright © Anderson, Howe, Wakeman
Text: Marshall Topham,
Additional Reading: Lyle Bingham, https://bridgerlandaudubon.org/

Additional Reading

Wild About Utah pieces by Marshall Topham https://wildaboututah.org/author/marshall-topham/

Washington County Utah https://www.washco.utah.gov/

Snow Canyon State Park, Utah State Parks, https://stateparks.utah.gov/parks/snow-canyon/

Joshua Tree National Landmark, US Bureau of Land Management, https://www.blm.gov/visit/joshua-tree-national-landmark

Red Cliffs Desert Reserve, Washington County & US Bureau of Land Management, http://www.redcliffsdesertreserve.com/