The Western fence lizard is one of several scaly species found at John Muir National Historic Site. This individual has a red marker on it's back put there by staff as part of survey efforts.
NPS
Reptiles on Mount Wanda
Reptiles like snakes and lizards are cold-blooded, meaning they don’t produce their own body heat. In the summer, they seek shade among the grass and trees, but during the winter, you might spot them sunbathing on your path! Below are some common and rare species you might encounter at the park:
Western Fence Lizard (Sceloporus occidentalis):
Known for their spiny scales and coloration ranging from gray to brown, these lizards are often called "blue bellies" due to the vibrant blue patches on males' throats and bellies. Fascinatingly,a study in 1998 by Robert Lane found that a protein in their blood can kill the bacteria that causes Lyme disease, helping ticks rid themselves of the illness after feeding on these lizards.
California Kingsnake (Lampropeltis getula californiae):
Typically around three feet long, California kingsnakes are recognizable by their alternating brown/black and white/cream bands. Though non-venomous and generally non-aggressive, they may hiss and shake their tails if disturbed. These snakes earned the title "king" for their ability to prey on other snakes, including rattlesnakes.
Alameda Whipsnake (Masticophis lateralis euryxanthus):
This slender, fast-moving snake is a threatened species found only in the San Francisco Bay Area, primarily within Contra Costa and Alameda counties. They grow to about four feet in length, with a black or brown back and a distinct yellow stripe along each side. Due to urbanization, their population has diminished, and park staff are actively working to conserve their habitat on Mt. Wanda.
California Slender Salamander (Batrachoseps attenuatus):
The most common salamander in the area, the California slender salamander, is often found in moist environments, such as underground or beneath objects. They are especially active during the rainy season. These salamanders are dark brown with a stripe along their back and are around five inches long, with tiny legs that make them resemble worms.
