Colorado Lizards A to Z: Identify All Types of Lizards in Colorado

While the arid plains and montane forests of Colorado might not immediately conjure images of tropical reptiles, the state is home to a surprising diversity of lizard species. These cold-blooded survivors are integral to the ecosystem, acting as both pest controllers and vital prey for birds of snakes. Understanding the types of lizards in Colorado requires looking beyond the common backyard visitor to appreciate the specialized adaptations that allow them to thrive in elevations ranging from the high desert to the foothills of the Rocky Mountains.

Common Lizards of the Front Range

The most frequently encountered lizards for residents and visitors alike belong to the family Phrynosomatidae, known for their hardy nature and intricate patterns. These small to medium-sized reptiles are typically found in areas with ample rock coverage or sparse vegetation where they can bask and hide. Identifying them is usually a matter of observing their distinct coloration and the texture of their scales, which often provides effective camouflage against the rocky terrain they inhabit.

The Western Fence Lizard

Perhaps the most iconic lizard in the state, the Western Fence Lizard (*Sceloporus occidentalis*) is easily recognized by its iridescent blue belly and throat, which becomes particularly vivid during the mating season. Often seen scaling wooden fence posts or rock walls, this species is remarkably tolerant of human presence. Its rapid darting movements and quick retreat to shelter make it a familiar sight in suburban areas throughout the state.

The Many-Spotted Earless Lizard

Contrary to its name, the Many-Spotted Earless Lizard (*Holbrookia multisporata*) does possess external ear openings, but they are often less prominent than other species. This lizard is distinguished by its vibrant rows of spots along the back and sides, set against a background that ranges from grey to reddish-brown. Unlike the fence lizard, the Many-Spotted Earless tends to prefer flat, open areas with loose sand or gravel where it can quickly bury itself to escape the intense midday sun.

Specialists of the High Country

As elevation increases, the environment becomes harsher, and only the most specialized species can survive. These high-altitude lizards have evolved to handle shorter growing seasons and colder temperatures, often displaying darker coloration to absorb heat more efficiently. Spotting one of these creatures above the timberline is a testament to the resilience of Colorado's wildlife.

The Mountain Short-horned Lizard

The Mountain Short-horned Lizard (*Phrynosoma hernandesi*) is a master of camouflage, resembling the pebbly texture of the alpine slopes it calls home. Unlike its cousin the Texas Horned Lizard, this species is less aggressive and relies heavily on camouflage and stillness to avoid predators. It is a sit-and-wait predator, feeding primarily on ants and adapting to the cooler temperatures of higher elevations where other lizards cannot survive.

The Sagebrush Lizard

Found in the westernmost reaches of the state, the Sagebrush Lizard (*Sceloporus graciosus*) inhabits the shrub-steppe ecosystems characteristic of Colorado's drier regions. Its keeled scales give it a rough, spiky appearance, and it is often found scrambling over sagebrush and juniper. This species is an important indicator of healthy rangeland health, as it requires specific vegetation structure to thrive.

Rare and Notable Visitors

Occasionally, lizards from outside the typical Colorado fauna make appearances, usually transported accidentally via agricultural products or vehicles. While these sightings are rare, they provide a fascinating glimpse into the broader reptilian diversity of the continent. Most of these "vagrants" are not able to establish breeding populations due to the state's climate, but they serve as interesting notes in the state's natural history.

The Common Leaf-tailed Gecko (Rare Vagrant)

Native to Madagascar, the Common Leaf-tailed Gecko is an extremely rare find in Colorado. Such appearances are almost certainly the result of accidental transport rather than natural migration. These masters of disguise would face insurmountable challenges in the Colorado climate, as they are adapted to the humid, tropical environments of their native island.

Distinguishing Features and Behavior

For the casual observer, differentiating between lizard species can seem daunting, but focusing on a few key characteristics simplifies the process. Tail structure, scale texture, and the presence of specific markings like stripes or spots are the primary differentiators. Behavior also plays a role; some species are strictly terrestrial, while others are adept climbers. Understanding these nuances allows for a greater appreciation of the complexity within Colorado's lizard populations.

When observing these creatures, it is crucial to maintain a respectful distance. Handling lizards can strip them of the protective oils on their skin and cause significant stress. By observing quietly and allowing them to go about their business—hunting, basking, and interacting with their environment—we ensure that these remarkable survivors continue to thrive in the diverse landscapes of Colorado.