Facts

Territory

The Mission Blue butterfly ranges from the San Mateo Peninsula near Crystal Springs Reservoir to the southern part of Marin County. As an endangered species, it is most readily observed at San Bruno Mountain, Milagra and Sweeney Ridges, Twin Peaks, the Marin Headlands, and Oakwood Valley. It inhabits small specks of grassland and rocky outcrops along these coastal hills and ridges. Its immediate year-to-year survival is dependent upon specific lupines on which it lays its eggs. In addition, its long-term prosperity may hinge upon native ants which protect its larvae, conservation minded humans, and a diverse and intact ecological system.


South San Francisco grasslands

South San Francisco grasslands

Marin Headlands

Marin Headlands

Buckeye and Owl Canyon

Buckeye and Owl Canyon

Summit looking towards Colma

Summit looking towards Colma