A mountain lion attacks mountain bikers in Orange County:
1 dead 4 injured, not to mention the lion that the rangers will probably terminate. NBC4 Article. The lion attacked twice in a row mountain bikers in the Whiting Ranch Wilderness Park. I am used to bike in Casper Park, pretty close to this place. I will probably think twice now before going back there.

In socal, there are many mountain lions (aka cougars or pumas). Until now I had not heard about adult casualties resulting of attacks in socal, but I know young kids were attacked in Casper Park a few years ago and that resulted in the park being closed for a long time. Attacks usually happen when an animal has rabbies or when a female protects cubs.

They live in the mountains around LA and San Diego which is quite surprising since this is one of the most urbanized area in the US.