Wed 13 Dec 2006
Nature’s Two Acres Part III: Insectivores and Not
Posted by DavidMitchell under Marin County, Point Reyes Station, West Marin nature, Wildlife
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I found this garter snake one morning warming itself in the sun on my driveway. Common garter snakes come in innumerable variations and are found in fields, forests and wetlands nationwide. Like this snake, adults average about four feet long. In West Marin, their diet typically consists of tadpoles, slugs, and earthworms. But unlike other snakes, they don’t eat insects. When first born, the snakes are prey for bullfrogs. Hawks and foxes eat adults.
Pacific tree frog hiding out in leaves from my persimmon tree.
Pacific tree frogs’ chirping is so dependable that Hollywood typically uses it whenever the sound of frogs is needed in a movie, even if it’s set in Africa.
The website NaturePark.com reports that the tree frog’s “color varies from almost a bronze brown to a light lime green. Individuals can change color in green and brown tones in a few minutes. This color change is related to the temperature and amount of moisture in the air, not the background color as in most other amphibians and reptiles. This color change gives it the protection of camouflage as it hops and crawls about on low leaves, branches and on the ground in open forests and forest edges looking for flying and crawling insects to eat.”
I photographed three lizards on the wall of my cabin and then was unable to find any naturalist either in town or at the Point Reyes National Seashore who could identify the green lizard at lower left.
I also checked the website wildherps.com operated by herpetologist John Sullivan of Pacific Grove. When I didn’t see the green lizard on his site, I emailed Sullivan photos of the three and asked for help. His answer: “I believe all three of your lizards are actually Western Fence Lizards (Sceloporus occidentalis). They have a fair amount of color variation, and the green one is within the range of colors I’ve seen.”
Charlotte’s Web (below). Every fall I can count on some garden orb weaver each evening stretching a web from my eaves to the railing of my deck near the front-door light.
“The building of a web is an engineering feat,” as Wikipedia aptly notes. The orb weaver “floats a line on the wind to another surface. The spider secures the line and then drops another line from the center, making a Y.
“The rest of the scaffolding follows with many radii of non-sticky silk being constructed before a final spiral of sticky capture silk.
“Orb weavers are three-clawed spiders, and the third claw is used to walk on the non-sticky part of the web.

“Characteristically, the prey insect that blunders into the sticky lines is stunned by a quick bite and then wrapped in silk. If the prey is a venomous insect, such as a wasp, wrapping may precede biting.”
Possums are found throughout West Marin wherever ponds, creeks, marshes, and even drainage ditches provide riparian habitat.
I photographed this possum when it stopped on my deck to wash its paws.
West Marin’s possums originated in the Deep South where “common opossums” are commonly called possums, thanks to a linguistic phenomenon known as aphesis.
“The common opossum,” writes Point Reyes Station biologist Jules Evens in The Natural History of the Point Reyes Peninsula, is “the only marsupial native to North America [but] is not native to Point Reyes or the Pacific Coast. After the first known introduction into California at San Jose about 1900 (for meat, delicious with sweet potatoes), opossums spread rapidly southward: by 1931 they were common on the coastal slope from San Francisco Bay south to the Mexican border. Point Reyes avoided the onslaught until about 1968.” They are nocturnal omnivores, eating plants, earthworms, slugs, insects, and roadkill.
An English major at Stanford, I graduated a quarter later than the rest of my class; in a moment of bohemian romanticism, I had left Stanford for three months in 1964 to attend the California College of Arts and Crafts. After graduating from Senator Leland Stanford’s “Farm,” I returned to Stanford in 1966-67 and received a master’s degree in Communications with a concentration in print media. My return was just as impulsive as my earlier fling at becoming an artist; I didn’t apply for graduate school (or even choose a field of study) until the first day of fall registration. To my parents’ surprise, as much as my own, I ultimately left Stanford as a budding journalist.
The Light won the Pulitzer Prize for Meritorious Public Service in 1979. It was only the fourth year since the Pulitzers began in 1917 that a prize in any division (e.g., editorial writing, foreign correspondence, breaking-news photography) went to a weekly. In The Light’s case, the prize was for an exposé and editorial crusade, both of which I mostly wrote, of the increasingly violent Synanon cult. Working with me on the investigation were Cathy and a UC Berkeley sociologist, Richard Ofshe. With their help, I subsequently wrote a book about our investigation, The Light on Synanon, which was made into a two-hour movie for CBS called Attack on Fear. Actor Paul Michael Glazer (AKA Starsky) played me.
The Point Reyes Light won 108 national, regional, and state journalism awards, as well as the Pulitzer Prize, during my 27 years as editor and publisher. After my retirement, I received a Career Achievement award from the Society of Professional Journalists Northern California Chapter, and the Marin County Board of Supervisors held its own ceremony to present me with a resolution honoring my work at The Light.