Rare mountain lion attack in California. 

Two brothers attacked, one fatally injured. 

Incident in remote Northern California. 

Younger brother calls 911 for help. 

Deputies find mountain lion near older brother. 

Shots fired to scare off the animal. 

Mountain lion euthanized after attack. 

Less than 50 lion attacks since 1890. 

Mountain lions known by various names. 

Lions inhabit diverse habitats in California.