Claremont, the eastern gateway to Los Angeles County and the western ingress to San Bernardino County, is a border town.

But the City of Trees sits astride another, less widely known but equally important boundary: the urban/wildland interface. The north Claremont foothills are a transition zone or “ecotone” between two ecosystems, coastal sage scrub and chaparral.

https://www.claremont-courier.com/mobile/article/t29500wild

Urban wildlife is behind the epidemic-level spread of typhus reported in Pasadena, and keeping feral cats and opossums out of yards and away from people is the key to reining in the serious disease, health officials said.
At least 20 people in Pasadena have come down with murine typhus this year, Pasadena interim spokeswoman Lisa Derderian said.

http://www.pasadenanow.com/main/health-officials-wildlife-especially-feral-cats-and-opossums-driving-pasadenas-typhus-spike/#.W7vbzZ9lDqB

Williamson Rock is a sheer granite wall that rises from chaparral in the San Gabriel Mountains National Monument. Crisscrossed with 300 routes, it has been a proving ground for Southern California rock climbers since the 1960s.
But in a move that outraged many in the climbing community, the area was shut down in 2005 to protect an isolated colony of federally endangered Southern California mountain yellow-legged frogs from being trampled.

http://www.latimes.com/local/california/la-me-reopen-williamson-rock-20181010-story.html

Saturday, Oct. 27, 11 a.m. to 4 p.m.

Shane's Inspiration at Griffith Park

Free

https://www.nbclosangeles.com/news/local/Mountain-Lion-Love-to-Purr-at-Free-P-22-Fest-498161501.html