As someone who spent about six years as a Los Angeles-area sports reporter zig-zagging across the Southland’s freeway system covering everything from college baseball to the Stanley Cup playoffs and high school water polo, I can vouch for difficult it is to traverse the Ventura, San Diego, San Pedro and Golden State Freeways.
So imagine how much of a challenge 405 (San Diego Freeway) could be for a resident mountain lion crossing through the canyons that are split by the freeway that runs north-south from the San Fernando Valley through West Los Angeles, LAX and Orange County before merging with I-5 on the way to San Diego.
Give it up to male mountain lion P-61! ?????? This four-year-old cat somehow managed to cross the 405 Freeway in the Sepulveda Pass area on the morning of July 19 between 2 and 4 a.m., according to National Park Service biologists. That's a rare and amazing feat! (1 of 4) pic.twitter.com/aSsS2LESge
This is the first time during the course of our 17-yr study of mountain lions that a GPS-collared lion has crossed the 405. In the same general vicinity where P-61 likely crossed, P-18 was hit & killed by a car in 2011 & another uncollared lion was hit & killed in 2009. (2 of 4) pic.twitter.com/LyvPdtROrg
The most famous cat to have crossed the 405 is P-22. He was not collared at the time so little is known about his journey. DNA tests indicate he was born in the Santa Monica Mtns. He crossed the 405 & the 101 on his journey to Griffith Park, where he’s lived for 7 yrs. (3 of 4) pic.twitter.com/rvJWDiPvtd
In addition to P-61, researchers are also aware of an uncollared male mountain that seems to inhabit the same relatively small area between the 405 and 101 Freeways. To learn more about P-61, check out our news release @ https://t.co/1nrqIiBCXo. (4 of 4)
THOUSAND OAKS, Calif. — The National Park Service has documented a rare case of a mountain lion crossing the 405 Freeway in the Sepulveda Pass area. The male mountain lion known as P-61 made his way east of the massive freeway sometime between the hours of 2:00 a.m. and 4:00 a.m. on the morning of July 19th.
This is the first time during the course of the 17-year study of mountain lions in and around the Santa Monica Mountains that a GPS-collared lion has crossed the 405 Freeway. In the same general vicinity where P-61 likely crossed, P-18 was hit and killed by a vehicle in 2011 and an uncollared lion was hit and killed in 2009.
“Although P-61 successfully crossed the 405, his feat is a reminder of how challenging Southern California’s road network is for mountain lions and other wildlife, as well,” said Jeff Sikich, biologist for Santa Monica Mountains National Recreation Area. “Others haven’t been so lucky.”
Freeways in the area act as fences for the local mountain lion population, hemming them in on an island of habitat, which has led to seriously low genetic diversity levels in the Santa Monica Mountains. During the course of the study, researchers have documented numerous mountain lions traveling right up to the edge of the freeway and not crossing.
The most well-known example of a mountain lion crossing the 405 Freeway is P-22, but he was not collared at the time, so little is known about his journey. DNA testing indicates that he was born in the Santa Monica Mountains and therefore had to make his way across both the 405 and the 101 Freeways on his journey to Griffith Park, where he has lived for more than seven years.
In addition to P-61, researchers are also aware of an uncollared male mountain that seems to inhabit the same relatively small area between the 405 and 101 Freeways. Surveillance camera footage occasionally surfaces with images of that lion, assuming it is the same one, dating back approximately five years.
“It will be interesting to see if P-61 stays in the area, whether he decides to challenge the uncollared lion, or if he heads back to the other side of the freeway,” said Sikich. “Although it’s a relatively small area of habitat, it’s certainly larger than the Griffith Park area and does have a patchwork of natural areas.”
Now that P-61’s GPS collar is recording data points in the area, it’s a good opportunity for researchers to learn about landscape connectivity in the highly fragmented area.
P-61 was first captured and outfitted with a GPS collar in October 2017. He weighed 119 pounds at his most recent capture and is believed to be approximately four years old.
Since 2002, the National Park Service has been studying mountain lions in and around the Santa Monica Mountains to determine how they survive in an increasingly fragmented and urbanized environment.
The California Department of Fish and Wildlife is responsible for overseeing the management and conservation of mountain lions in the state.
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. A unit of the National Park Service, 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. For more information, visit nps.gov/samo.