Biologists aim for an accurate population estimate for California's cougars in a highly ambitious survey.

Extreme heat is interfering with search efforts for the missing woman, who disappeared in early June.

The group that sued to restore the Yosemite valley to its natural state vows to take the case to the California Supreme Court.

The measure would fight to prevent extinction for the iconic butterfly.

The woman escaped the encounter at Vasquez Rocks Park with minor injuries.

Access to the Monterey County coast should be restored by the end of July.

The "fire hydrant" technology would make it easier for firefighters to do water drops in remote areas.

The death, in the park's Middle Fork of the Kaweah River, is the first river-related fatality of the season.

The season extension makes Mammoth the last California ski resort standing this spring.

The national park is increasingly turning to volunteer Search & Rescue workers to keep up with a jump in emergencies.

The New Zealand woman resorted to drastic measures after falling and breaking her pelvis.