Northern Spotted Owls

Because of its role as an indicator species for forest ecosystems, the northern spotted owl (Strix occidentalis caurina) has become one of the best-studied owls in the world. It has been listed as a threatened species since 1990, and populations continue to decline rangewide as a result of habitat loss. Competition with other non-native species such as the larger, more aggressive barred owl (Strix varia) has become the other greatest threat to the species.

Spotted owls do not build their own nests. Instead, they rely on tree cavities or broken tree tops, abandoned raptor nests, and accumulated debris. While these nesting materials are all commonly found in the mature trees of old growth forests, this habitat has been heavily affected by clear-cut logging in the Pacific Northwest. Although the protected forests in Marin County are not as widely threatened by logging, they are under continual pressure from urban development, intense recreational use, and habitat change from diseases such as Sudden Oak Death. Despite these pressures, the northern spotted owl is still found throughout Marin County at Point Reyes National Seashore, Golden Gate National Recreational Area, and Muir Woods National Monument.

Adult northern spotted owl on a branch
Quick Reads

Browse articles and information summaries about northern spotted owls in the San Francisco Bay Area.

Adult northern spotted owl and fledgling perched on branch.

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Northern spotted owl adult with fledgling
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Close-up of northern spotted owl.
References and Links

Explore more research, reports, and resources on northern spotted owls in San Francisco Bay Area parks.

Long-term Monitoring

The San Francisco Bay Area Network Inventory and Monitoring Program and its partners began long-term monitoring of Northern Spotted Owls in Golden Gate National Recreation Area, Muir Woods National Monument, Point Reyes National Seashore and other public lands in Marin County in 1999. Monitoring the owls helps biologists gauge the ecological health of their forest habitat. Monitoring data also helps land managers to minimize disturbance to nest sites, learn how threats affect existing populations, and plan future conservation efforts.

Two adult northern spotted owls looking to the side at the same time
Northern Spotted Owl Monitoring

Dig in to monitoring protocols, reports, and more on the San Francisco Bay Area Network's Northern Spotted Owl Monitoring page.

Last updated: June 27, 2018