Update on Park Closures
All NPS trails are open, w/the exception of part of the Satwiwa Loop Trail. Rancho Sierra Vista/Satwiwa is only open sunrise to sunset. Point Mugu State Park re-opens 5/24. More »
Trucks on Cheeseboro Canyon Trail
Occasional truck traffic (approx 6 trips per day) will take place on Cheeseboro Cyn Trail weekdays between 8am & 4pm for demolition and removal of Cheeseboro Tank. Should be completed by 6/21/13. Check back for updates or call 818-889-8996. More »
Dead Mountain Lion Was Exposed to Rodenticides
Contact: Kate Kuykendall, 805-370-2343
Contact: Dr. Seth Riley, 805-370-2358
THOUSAND OAKS, Calif. - Necropsy results from the mountain lion found dead by hikers last month in the Santa Monica Mountains were inconclusive, but did indicate rodenticide exposure. Because the carcass was partially decomposed, the actual cause of death cannot be determined.
"Unfortunately, we'll never know exactly why this animal died," said Dr. Seth Riley, an expert on urban wildlife with Santa Monica Mountains National Recreation Area (SMMNRA). "Mountain lions in this region face a number of challenges to survive and rodenticide exposure is certainly a common - and entirely preventable - health risk for local wildlife."
Laboratory tests conducted by the California Animal Health and Food Safety Laboratory and the University of California at Davis detected exposure to two anticoagulant compounds commonly found in rodenticides, though at relatively low levels. Anticoagulants lead to uncontrolled bleeding and have been confirmed as the cause of death for two other mountain lions in the Santa Monica Mountains during the last ten years. The exposure occurs indirectly, such as when the lions eat animals that have eaten the poison.
The death did not appear to be the result of a conflict with another lion, the leading cause of death among the 26 lions studied by National Park Service biologists over the last decade. The relatively young animal was not emaciated and did not seem to suffer from a lack of nutrition. Plague, which has been found in other mountain lion populations outside of the state, was also ruled out as a possible cause of death.
Puma-25, as the animal was known, was approximately one year old at the time of her death and had been traveling with her mother and brother.
More information about the harmful effects of anticoagulant rodenticides, as well as suggested alternatives, can be found here.
Santa Monica Mountains National Recreation Area (SMMNRA) is the largest urban national park in the country, encompassing more than 150,000 acres of mountains and coastline in Ventura and Los Angeles counties. It comprises a seamless network of local, state, and federal parks interwoven with private lands and communities. As one of only five Mediterranean ecosystems in the world, SMMNRA preserves the rich biological diversity of more than 450 animal species and 26 distinct plant communities. Learn more at www.nps.gov/samo.
Did You Know?
At the geographical center of Los Angeles is a national park site. At Franklin Canyon Ranch in Santa Monica Mountains National Recreation Area, you can see cityscapes and natural views. The recreation area extendes in an east-west direction running through the heart of the city.