It’s Rattlesnake Mating Season!

August 31, 2010 at 2:43 pm · Filed under Hiking, Peninsula, Rattlesnakes, Safety, South Bay

By Kelsey Grousbeck, Intern

As you make your way around Jasper Ridge and surrounding hills, it’s not just the rock formations that are serpentine. The Northern Pacific Rattlesnake (Crotalus viridis oreganus) is native to Northern California and breeds in the late summer, favoring these rocky grasslands for their habitat. Though rattlesnakes strike fear into many hikers, that is typically all the striking they do. The California Department of Fish and Game assures hikers that attacks are accidental and, unless provoked, these snakes favor retreat and give clear warning signs (such as their rattle) before attacking (http://www.dfg.ca.gov/news/issues/snake.html).

The Northern Pacific Rattlesnake is also found in mixed woods and sagebrush from central California up to Washington and British Columbia, extending into parts of Idaho. Depending on their surroundings, their coloring can vary from olive to gray or tan with darker blotches. They get to be an average length of about 2 feet, with some as long as 5 feet, and in the wild it is estimated they live to be about 15 years old. Their prey consists of reptiles, amphibians and small rodents, though the adult California Ground Squirrel has developed immunity to their venom and responds aggressively if attacked.

Range of Northern Pacific Rattlesnake in California

Though they breed in the summer, rattlesnake females store the sperm and do not reproduce until the following spring. A female Northern Pacific Rattlesnake can reproduce only once every three years because they must double their body weight before pregnancy. The increased weight allows them to survive since they fast for almost 19 months during pregnancy and the following hibernation period. Females give birth to about 2-8 live young in mid-September. These young have underdeveloped “buttons” where their rattles will be, which they do not fully develop until they are over a year old. Juvenile rattlesnakes, despite not having developed rattles, still contain as much venom as adults.

Northern Pacific Rattlesnake

Rattlesnake bites are rarely fatal to humans, so if you have been bitten don’t panic. Instead, rinse the wound with soap and water, remove anything that may constrict swelling such as watches or rings, apply a cool, wet cloth to the area and get to a hospital or poison control center as soon as you can. Do not apply a tourniquet or ice to the bite and never cut the wound or try to suck the venom out with your mouth, as those practices can end up harming you further.

Northern Pacific Rattlesnake

To avoid an unfavorable interaction with a rattlesnake, be sure to wear proper hiking boots and long pants while hiking in areas that could be snake habitat. Additionally, step on top of rocks or stumps as opposed to over them, since snakes enjoy resting against the side of these trail obstacles. To be extra cautious, use a walking stick to prevent a threatened snake from attacking if you accidentally walk too close.

The most important fact to remember when you come across a rattlesnake is that they are a threatened species and should be respected and left alone. Once you know how to avoid engaging a rattlesnake, hiking in the summer and fall can be very exciting, especially when you can try to spot young rattlesnakes before they head to their burrows to hibernate. So happy trails and beware any ominous rattle sounds!

Edit: These photos were taken yesterday by Audrey at Russian Ridge Open Space Preserve!

Rattlesnakes at Russian Ridge© Audrey Rust

Rattlesnakes at Russian Ridge © Audrey Rust

Rattlesnakes at Russian Ridge © Audrey Rust

And a neat video from Animal Planet (Thanks, Audrey!):

Comments (4)