A new litter of kittens was discovered in the Santa Monica Mountains, and while the newest members of the "P" family -- P-70, P-71, P-72, and P-73 -- appeared to be in good health, researchers say they are the product of inbreeding. It's a growing problem with mountain lions south of the 101 Freeway, since the freeway prevents them from exploring beyond the area, they said Sept. 4, 2018.

Photo Credit: National Park Service