Yarrow'S Spiny Lizard

sceloporus jarrovii

Yarrow's Spiny Lizard is an exceptionally resilient and striking reptile native to the rugged mountainous regions of the southwestern United States and Mexico. Thriving in rocky canyons and oak-pine forests at high elevations, this lizard is celebrated for its remarkable adaptations to cold environments. Unlike many of its egg-laying relatives, this species gives birth to live young, which is a critical strategy for survival in frosty montane climates. Observing these lizards is a delight for nature enthusiasts as they are highly active during the day, frequently seen basking on boulder faces, rock crevices, or tree trunks. With a bold disposition, they defend territories using energetic push-up displays, revealing flashes of brilliant blue on their undersides. Their ability to tolerate chilly temperatures makes them one of the few reptiles active on sunny winter days, adding a touch of vibrant life to the mountain slopes year-round. If you want to identify Yarrow'S Spiny Lizard in the wild, use the Snappit app.

Habitat: Found in rocky montane habitats, such as canyon walls, talus slopes, and boulder piles within oak-pine forests at high elevations.

Appearance

This medium-sized lizard is easily identified by its heavily keeled, pointed, and spiny scales that give it a rough, armored appearance. It features a conspicuous black collar around its neck, bordered by crisp white or light-yellow bands. The base coloration ranges from greenish-blue to dark grey, often speckled with pale blue, yellow, or green spots. Males are particularly stunning, sporting bright metallic-blue patches on their throat and the sides of their belly, which intensify during the breeding season. They reach an average total length of 11 to 24 centimeters, including their long, tapered tail.

KingdomAnimaliaPhylumChordataClassReptiliaOrderSquamataFamilyPhrynosomatidaeGenusSceloporus

Yarrow'S Spiny Lizard

Interesting facts

Because they live in cold mountain heights, they can remain active even during sunny winter days when other reptiles are completely dormant.

They are known as mood ring lizards because they can rapidly change their color from dark charcoal to vibrant metallic blue depending on the temperature and their social interactions.

To defend their territory or woo mates, males perform rhythmic push-up displays, flashing their bright blue throat and belly patches to communicate from afar.

Special abilities

They can darken their skin in the cool morning hours to absorb more solar radiation, shifting to a lighter, reflective color as temperatures rise.

Unlike most lizards that lay eggs, they give birth to fully formed live young, protecting the embryos from freezing mountain temperatures.

When threatened by a predator, they can self-amputate their tail, which continues to wiggle and distract the predator while the lizard escapes.

Measurements & details

Length: 11-24 cm
Weight: 0.01-0.04 kg
Lifespan: 3-6 years
Top Speed: 15 km/h
Clutch Size: 2-15
Incubation: 150-180 days

Diet & Feeding

They primarily feed on a wide variety of terrestrial insects and spiders, hunting actively along rocky surfaces during the day.

Age differences: Juveniles consume smaller soft-bodied insects like aphids and small flies, whereas adults can tackle larger, hard-shelled beetles and wasps.