Desert Night Lizard

Fascinating facts about the Desert Night Lizard

• A 2-inch desert night lizard can weigh as little as 1.1 g, making it lighter than a paperclip and highlighting how evolution can shrink a predator to fit into tiny rock cracks.
• When night falls, these lizards shift from a dark brown shade to a light olive coat in minutes, a rapid color flip that lets them melt into sun-warmed rocks and stay hidden from predators.
• Family groups can hold up to 20 individuals through winter, and those with close kin stay together longer, showing that even tiny reptiles gain a survival edge from staying in related packs.
• Females give birth to just 1–3 live young between August and December, and each newborn measures only about 22 mm, roughly the length of a toothpick, demonstrating a strategy of producing few, well-developed offspring.
• Gestation lasts about 90 days at temperatures of 75–90 °F, after which a 10-minute delivery adds new members to the colony, illustrating how timing and temperature control are vital for reptile reproduction.

At a glance

About the Desert Night Lizard

The desert night lizard (Xantusia vigilis) is a diminutive reptile, measuring just 1.5 to 2.75 in (3.8 to 7.0 cm) from snout to vent, with a tail of comparable length. Its skin shifts like a living chameleon, light olive at dusk, dark brown under the noon sun, allowing it to blend seamlessly with the rocky crevices and fallen plant debris of the Mojave and Sonoran deserts, as well as the Yucca-laden slopes of the Southern California Eastern Sierra, San Gabriel Mountains, Baja California, southern Nevada, southwestern Utah, and the extreme western reaches of Arizona. Males are slightly smaller and lighter than females, bearing a stouter tail and enlarged femoral pores, while both sexes display 12 longitudinal rows of rectangular ventral scales and a mosaic of granular dorsal scales. A skilled climber, it preys on termites, small insects, spiders, and other arthropods, capturing its meals with quick, precise strikes.

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