Blainville's horned lizard

Blainville's horned lizard, scientifically known as Phrynosoma blainvillii and also referred to as the San Diego horned lizard, is a distinctive reptile native to the arid and semi-arid regions of Southern California and northern Baja California, Mexico. This species is instantly recognizable by its flattened body and the prominent, spiky horns adorning its head, complemented by smaller spikes distributed across its body and tail. Its coloration, typically ranging from red, brown, yellow, to gray, is highly variable and serves as effective camouflage, usually matching the prevailing soil color of its environment.

Habitat and Distribution

These lizards are primarily found in areas characterized by sandy soil, low vegetation, and a close proximity to ant hills, often in mountainous terrains. Their range extends from the Central Valley of California southward through Southern California to the northern reaches of Baja California. Blainville's horned lizards have been documented at a wide range of elevations, from near sea level to over 2,000 meters above sea level, demonstrating their adaptability to varied topographical conditions.

Biology and Behavior

The diet of Blainville's horned lizard is predominantly composed of harvester ants, though they also consume other insects such as spiders, beetles, and termites. Their survival hinges on effective defensive strategies. Initially, they rely on immobility and camouflage to avoid detection. If discovered, they may seek refuge in dense vegetation or burrow into the sand. When directly threatened, they can exhibit defensive behaviors including hissing, biting, and employing their cranial and body horns as weapons. Perhaps their most remarkable defense mechanism is the ability to squirt blood from their eyes, a tactic used to startle and deter predators.

Reproduction and Conservation

The reproductive period for Blainville's horned lizard in Southern California spans from early March to June. Females typically lay between 6 to 21 eggs annually, which hatch a few months later, usually in August or September. Unfortunately, populations of Blainville's horned lizard face significant threats. Urbanization and habitat loss are major drivers of their decline, as are invasive species like the Argentine ant, which disrupts their primary food source. Historical over-collection for the curio trade also had a severe impact on their numbers in the past. Consequently, the species is recognized as a California species of special concern, highlighting the need for ongoing conservation efforts.