Western Fence Lizard (Sceloporus occidentalis) lives in dry rocky areas across Western North America. It feeds on insects and spiders. Its conservation status is Least Concern.
Fascinating facts about the Western Fence Lizard
- From sea level up to 10,800 ft, this lizard thrives in grasslands, chaparral, sagebrush, woodlands, conifer forests and even farmland,. By exploiting diverse micro-habitats, the species remains common across its wide western U.S. range, supporting many predators that rely on it for food.
- Urban expansion has reshaped the lizard's anatomy: city-dwelling individuals develop shorter limbs and toes because they now scramble over concrete and metal rather than woody branches. Simultaneously, hotter urban microclimates cause each scale to grow larger while the total number of scales drops, a trade-off that reduces water loss and heat load. These rapid morphological tweaks illustrate how quickly a native reptile can evolve to survive in human-altered landscapes.
- During breeding season a male stakes out a territory up to 7.5 m in radius, defending it with push-up displays and occasional combat. This spatial claim lets him showcase his bright blue belly and throat patches to passing females while deterring rivals.
- Measuring just 5.7-8.9 cm from snout to vent and stretching to about 21 cm total, the western fence lizard fits on a ruler yet packs a vivid blue belly that flashes when it basks.
- Where western fence lizards abound, Lyme disease cases drop because ticks that bite them lose the Lyme-causing bacterium. A protein in the lizard's blood clearing the infection from the tick's gut and rendering it harmless.
Sources
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At a glance
RangeWestern North America
HabitatDry rocky areas
DietInsects and spiders
About the Western Fence Lizard
As the sun-baked rocks of the western landscape awaken from their slumber, the Western Fence Lizard stirs to life, its scaly body a masterful blend of earthy tones that allow it to melt seamlessly into the rugged terrain. With a darting, erratic gait, it dances across the rocky outcroppings, its spiky scales glinting like tiny jewels in the bright sunlight as it pursues its insect prey with relentless zeal. In this arid world of scrub and stone, the Western Fence Lizard is a tiny, unassuming monarch, its very existence a testament to the enduring power of adaptation and resilience.
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