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Surprising and Sometimes Scary, Snakes Are a Vital Part of Topanga’s Ecology
If you are close enough to see the vertical pupil in the rattlesnake’s eye, you are probably too close. That diamond-shaped head is equipped with fangs that contain a powerful neurotoxin, but the resident species of rattlesnake, while potentially dangerous, is rarely aggressive. Photo by Suzanne Guldimann

Surprising and Sometimes Scary, Snakes Are a Vital Part of Topanga’s Ecology 

If you are close enough to see the vertical pupil in the rattlesnake’s eye, you are probably too close. That diamond-shaped head is equipped with fangs that contain a powerful neurotoxin, but the resident species of rattlesnake, while potentially dangerous, is rarely aggressive. Photo by Suzanne Guldimann

It’s snake weather in Topanga! Most reptile species in the Santa Monica Mountains don’t hibernate, they brumate—becoming inactive during cold weather and active during warm weather. On summer days when there is a heavy marine layer, snakes may only be out during the warmest part of the afternoon, but during hot weather, when the ground retains heat, they can remain active late into the night. That can be a problem for their human neighbors, and never more so than when so many of us are spending more time outdoors on decks and in our gardens. 

 There are 14 native species of snake in the Santa Monica Mountains but only three or four are commonly seen, and only one has venom that is hazardous to humans and pets: the Southern Pacific Rattlesnake (Crotalus viridis).

Rattlesnake bites usually involve accidentally stepping on or disturbing a snake while reaching into brush, rocks or a woodpile, or during an attempt to handle or move a snake. Dogs, cats and horses are also at risk from rattlesnake bites. Not all bites result in venom being injected into the wound, but a rattlesnake bite is a serious medical emergency that requires immediate professional treatment. 

Staying on trails and away from deep brush, grass or rocks is the best way to avoid encounters with rattlesnakes. It’s a good idea to regularly check tempting hiding places like patio furniture and children’s play equipment. Rattlesnakes are also attracted to concrete or brick driveways that hold the heat of the sun. They have been known to make their way into Topanga homes through open doors or even pet flaps. Make sure doors are shut at night and that screens fit well and don’t have gaps or holes.

Rattlesnakes don’t always rattle and it can be difficult to tell at first glance what kind of snake one is dealing with. It’s a good idea to treat all snakes with respect and give them plenty of room. It’s also helpful to know how to tell a rattlesnake from its closest look-alike, the harmless and benign gopher snake (Pituophis catenifer)

Rattlesnakes can be vividly patterned with black and yellow diamonds or an almost uniform dull charcoal color, but they all have large scales and a big triangular head—the glands that produce the venom are responsible for the shape. The rattlesnake’s eyes have a vertical pupil, but it may be hard to see, since the eyes can appear dark. Adult rattlesnakes are chunky, tapering dramatically at both ends. 

The gopher snake has a dark patch under its eye intended to fool predators into thinking that it is a rattlesnake, but this species lacks the diamond-shaped head, the fangs and venom and the infamous tail rattles of the rattler. Photo by Ann Dittmer

Gopher snakes are never chunky, even when they grow large. They have smaller scales in a more muted pattern and they taper to a long skinny tail. Unlike rattlesnakes, this species has a small head with round pupils. Black patches under each eye create the illusion that this species has the rattler’s distinctive vertical pupil, but that is just a disguise, as is this snake’s ability to flatten its head and shake its tail in an effort to fool potential predators. 

The striped racer and the similar appearing but unrelated two-striped garter snake are fearless but harmless snakes that often make their home alongside humans. This racer has lived for several years in the same Woodland Hills garden. Photo: Ann Dittmer

The two-striped garter snake (Thamnophis hammondii)  is another frequent backyard resident, together with the California striped racer (Coluber lateralis lateralis). They might surprise an unsuspecting human, but these slender and speedy snakes are harmless to humans and neither one resembles a rattlesnake. 

The beautiful California kingsnake used to be common in Topanga, now it’s rarely seen. Harmless to humans, this beneficial species preys on rodents and other reptiles, including rattlesnakes. Photo by National Park Service

 The beautiful black or brown and yellow striped California kingsnake (Lampropeltis getula californiae), and spectacular yellow, black and red California mountain kingsnake (Lampropeltis zonata) used to be common in Topanga. Now they are a rare sight. 

There are several snake species that are almost never seen, even though they are common backyard species that live alongside their human neighbors. 

Local naturalist Ann Dittmer photographed this gentle, jewel-like ringneck snake. This rarely seen species is a common Topanga garden resident, where it hunts slugs and insects. Photo: Ann Dittmer

You have to look harder to find the shy and retiring ringneck snake, a small constrictor that lives a quiet life under stones and in woodpiles, where it hunts for beetles and slugs, and the worm-like western blindsnake, or threadsnake (Rena humilis), which spends most of its life in the soil, where it hunts ants.

The worm-like Western threadsnake, or blindsnake, spends almost its entire life in the soil, where it hunts ants. Photo by National Park Service

Most of us coexist peacefully and often unknowingly with our snake neighbors, and unless it’s a rattlesnake in the wrong place, their presence is another amazing aspect of life in the canyon and not an issue, but it is good to be aware of their presence, especially in early summer when encounters are more common.

People who live in snake hotspots might consider buying a snake pole—a sort of shepherd’s crook for safely picking up snakes. There are also a number of local snake wranglers who will remove rattlers and safely relocate them away from human habitation for a fee. 

Snakes are critically important for keeping a healthy ecological balance. They are also beautiful and amazing—from a safe distance!

Learn more about local snake species at the Los Angeles Natural History Museum’s RASCals program—Reptiles and Amphibians of Southern California:, or visit the Santa Monica Mountains National Recreation Area website for a downloadable list of local reptile species:

Need to relocate a rattlesnake? Try professional snake wrangler Bo Slyapitch, Or check out our collection of other snake wranglers in and around the Topanga area in our Resource section

Have you encountered a snake in your garden or on the trail this spring? Send us a photo:

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1 Comment

  1. Paul Edmondson

    As a youngster, I was blessed to live in the canyon and equally blessed to catch two fangless night snakes and two two western blue racers. I lived just up the hill West of the Old Topanga school by Melchers Rifle Range.
    While I never caught a Coral King snake, I certainly never stopped looking. I left the Canyon in 1959 but brought all of my memories with me.
    Paul Edmondson

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