This amazing video of a mountain lion mother and her cubs inside their den is giving new hope for the species' survival in Sonoma County.SONOMA COUNTY, Calif. (KGO) -- RELATED: Secret life of Bay Area animals exposed -- researchers discover how mammals make most of Mt. TamRELATED: Mountain lion spotted walking in yard of San Carlos home For more stories, photos, and video on mountain lions, visit this page. Report a correction or typo