Sceloporus becki

The Island Fence Lizard (Sceloporus becki)

The Island Fence Lizard, scientifically classified as Sceloporus becki, is a unique species of lizard found exclusively on the Channel Islands of California. It shares a resemblance with mainland subspecies of the western fence lizard but is distinguished by several key characteristics, most notably the vibrant blue coloration on the sides of the belly, particularly prominent in adult males. This species is also sometimes referred to as the "blue belly lizard" due to this striking feature.

Physical Characteristics and Behavior

Sceloporus becki is a relatively small lizard characterized by its keeled and pointed dorsal scales, which are uniform in size across its back, sides, and belly. The scales on its thighs are smaller and predominantly keeled, while the rear of its limbs often displays yellow or orange hues. The overall coloration of the lizard can range from brown, gray, or black, often featuring blotches that may form stripes or irregular lines along its sides. In males, the blue belly markings are bordered in black, and they also possess a black patch on the throat and enlarged postanal scales. Females typically exhibit fainter or absent blue markings and may have dark bars or crescents on their backs.

These lizards are diurnal and thermoregulatory, most active during warm temperatures. The consistent climate of the Channel Islands allows for year-round activity. They are frequently observed basking in sunny locations such as stream banks, on driftwood, grassy hillsides, and even in areas of human habitation, often perching on rocks, logs, fences, and walls. Males actively defend territories, using elevated perches to survey their surroundings. Their courtship rituals involve head-bobbing and push-up displays to impress females and assert dominance. A notable defense mechanism employed by the Island Fence Lizard is autotomy, the ability to detach its tail to distract predators, allowing the lizard to escape.

Reproduction and Etymology

Reproduction for Sceloporus becki typically occurs in the spring, with adults mating in their second year. Females lay between one and three clutches of eggs, each containing three to seventeen eggs, from April through July. These leathery, white eggs measure approximately 8 by 14 mm and take about 60 days to hatch, usually between July and September. Females deposit their eggs in small pits of loose, damp soil, often during the night.

The specific epithet, "becki," honors Rollo Howard Beck, an American ornithologist who was responsible for collecting the initial specimens of this species, cementing his contribution to its scientific discovery.