Total number of acres actively managed by the Marin County Open Space District (MCOSD).

Percent of historical Northern Spotted Owl sites occupied by pairs each year, as surveyed by the National Park Service and Point Blue Conservation Science.

Proportion of the 72 sites occupied by Spotted Owl pairs in 2018 by landowner or land manager, as surveyed by Point Blue Conservation Science and the National Park Service. Not all potential habitat is surveyed every year, so actual numbers of pairs per land management agency or owner may differ from these figures.

Percent of Northern Spotted Owl pairs with known successful nests each year, as surveyed by the National Park Service and Point Blue Conservation Science. Data are collected on California State Parks, Marin County Parks, Marin Municipal Water District, Municipal, National Park Service, and private lands.

Proportion of Northern Spotted Owl nest trees by species, from 1997 to 2018, for 584 nest sites monitored by Point Blue Conservation Science and the National Park Service throughout Marin County.