Crevice Spiny Lizard

sceloporus poinsettii

The Crevice Spiny Lizard (Sceloporus poinsettii) is a robust, heavily armored reptile native to the arid rocky environments of the Chihuahuan Desert region, stretching across the southwestern United States and northern Mexico. These highly adapted lizards are famous for their affinity for rocky outcrops, limestone ledges, and deep crevices, where they seek refuge from both predators and the intense desert heat. Renowned for their spiked, overlapping scales and watchful behavior, they are an iconic sight for hikers exploring arid canyons. Unlike many other lizards in their family, Crevice Spiny Lizards are viviparous, giving birth to fully formed live young rather than laying eggs. This unique reproductive strategy, combined with their striking territorial displays and remarkable agility on vertical rock surfaces, makes them one of the most fascinating reptiles of the American desert southwest.

Habitat: Found in arid rocky canyons, limestone cliffs, and boulder piles where deep crevices provide shelter.

Appearance

This lizard is easily recognized by its stocky build, heavily keeled and pointed scales, and a prominent black-and-white collar around its neck. Its body coloration ranges from olive, grey, to reddish-brown, with dark crossbands running down its back and a tail ringed with distinct black and white bands. Adult males display vibrant blue patches on their throats and the sides of their bellies, which become especially bright during the breeding season. They are relatively large for their genus, typically reaching lengths of 20 to 30 centimeters, including their banded tails.

KingdomAnimaliaPhylumChordataClassReptiliaOrderSquamataFamilyPhrynosomatidaeGenusSceloporus

Crevice Spiny Lizard

Interesting facts

The species name 'poinsettii' honors Joel Roberts Poinsett, the American diplomat who also introduced the Poinsettia flower to the United States.

To defend their territory, males perform a series of rapid 'push-ups' while flashing their bright blue belly patches to warn off rivals.

Unlike most other spiny lizards which lay eggs, the Crevice Spiny Lizard gives birth to live young (viviparity), an adaptation suited to variable desert environments.

Special abilities

When threatened, this lizard retreats into a rock crack and inflates its body with air, locking its spiny scales against the rock walls to make extraction by predators nearly impossible.

It can voluntarily shed its tail when grabbed by a predator, leaving the wriggling tail behind as a distraction while the lizard escapes.

It utilizes its dark dorsal patterns to quickly absorb solar radiation on cool mornings, rapidly raising its body temperature to optimal hunting levels.

Measurements & details

Length: 20-30 cm
Weight: 0.04-0.12 kg
Lifespan: 5-10 years
Top Speed: 15 km/h
Clutch Size: 3-13
Incubation: 90-120 days

Diet & Feeding

While primarily feeding on a wide variety of terrestrial insects and spiders, adults will occasionally consume soft plant matter such as flowers and tender leaves.

Age differences: Juveniles are strictly insectivorous, focusing on small soft-bodied insects, whereas mature adults occasionally supplement their diet with plant matter.

Primary Foods

Beetles
Grasshoppers
Crickets
Spiders
Tender leaves

Foraging Method

Ambush

Ecological connections

hunts

Desert Stink Beetle

Eleodes obscurus

Preys heavily on this abundant desert beetle.

eaten by

Greater Roadrunner

Geococcyx californianus

Routinely preys upon the lizard, pulling it from crevices or catching it while basking.

competitor

Ornate Tree Lizard

Urosaurus ornatus

Competes for basking sites, crevice shelters, and insect prey.

Traits

No trait badges are assigned for this object yet.

Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Crevice Spiny Lizard?

The easiest way to identify Crevice Spiny Lizard is to use the Snappit nature identifier app.

How long is Crevice Spiny Lizard?

20-30 cm

How much does Crevice Spiny Lizard weigh?

0.04-0.12 kg

How long does Crevice Spiny Lizard live?

5-10 years

How fast can Crevice Spiny Lizard move?

15 km/h

What does Crevice Spiny Lizard eat?

While primarily feeding on a wide variety of terrestrial insects and spiders, adults will occasionally consume soft plant matter such as flowers and tender leaves.

Where is Crevice Spiny Lizard usually found?

Found in arid rocky canyons, limestone cliffs, and boulder piles where deep crevices provide shelter.

How does Crevice Spiny Lizard hunt?

Ambush