{"id":21,"date":"1970-01-01T00:00:00","date_gmt":"1970-01-01T00:00:00","guid":{"rendered":"http:\/\/weebly-import-page-16"},"modified":"2026-07-01T02:50:55","modified_gmt":"2026-07-01T02:50:55","slug":"burrowingowls","status":"publish","type":"page","link":"https:\/\/sfbbo-test.twomoons.systems\/staging\/1924\/burrowingowls\/","title":{"rendered":"Burrowing Owls – San Francisco Bay Bird Observatory"},"content":{"rendered":"\n

Western Burrowing Owl Research<\/span><\/h2>\n\n\n\n

Quick links:\nSanta Clara Valley Habitat Plan  <\/a><\/strong>\u2022  Badger and Burrowing Owl Habitat Study<\/a> \u2022 2023-2026 Strategic Plan<\/a><\/strong><\/p>\n\n\n\n

\n
\"\"\/<\/figure>\n\n\n\n

The Western Burrowing Owl used to be found living and nesting at many locations throughout the Bay Area. The charismatic bird is the only owl species that is active during the day and has always been a favorite among birders. Unfortunately, in recent years the species has been listed by the State of California as a Species of Special Concern. In California these owls are primarily threatened by habitat loss due to urban development, eradication of ground squirrels (which provide the burrows the owls use to nest), and intensive agricultural practices. <\/p>\n\n\n\n

In 2012, SFBBO began a study to test strategies to enhance Burrowing Owl habitat in the Warm Springs Unit of the Don Edwards San Francisco Bay National Wildlife Refuge in Fremont. In 2014, we began assisting the Refuge in conducting annual surveys to monitor the quality of this habitat, performed vegetation management for weed abatement, and recruited and coordinated community science volunteers to perform spring and summer Burrowing Owl breeding and wintering surveys to estimate owl population size and assess nest success and worked actively to to improve foraging habitat for this species.<\/p>\n\n\n\n

This led to a new five-year project for the Santa Clara Valley Habitat Agency in 2015 to partner with other organizations to monitor and enhance habitat for two of the last Burrowing Owl populations in the Bay Area at the National Wildlife Refuge property in Warm Springs, Fremont, and at the San Jose-Santa Clara Regional Wastewater Facility near Alviso. In addition to surveys and habitat work, we also used nest cameras to capture predator behavior.<\/p>\n\n\n\n

In 2019, we concluded this five-year project and then joined forces with the Midpeninsula Regional Open Space District and Pathways for Wildlife to conduct Burrowing Owl surveys in the Santa Cruz mountains to investigate if owls used badger burrows there. <\/p>\n\n\n\n

Through our Strategic Plan<\/a> we aim to expand the use of our data and research, and engage with other scientific communities and resource-management agencies, to address climate change, habitat loss, and other environmental issues. We hope you will join our community of scientists, resource managers, and environmental organizations by using our data and analysis to better understand how birds are doing and find ways to promote sustainability in your community.<\/p>\n<\/div>\n\n\n\n

Jump to the following sections: Impact of Our Work<\/a>, View Our Data<\/a>, and Thanks to Our Supporters<\/a>.<\/p>\n\n\n\n

\n\n\n\n

Impact of Our Work<\/h2>\n\n\n\n

Share Data Regionally<\/strong><\/em> – Our data was included in the Don Edwards San Francisco Bay National Wildlife refuge’s biological reports and we also shared it with other researchers and organizations who conduct relevant work. This work helped in habitat protection for Burrowing Owls in San Jose<\/a>.<\/p>\n\n\n\n

Enhanced Bay Area Habitat<\/strong><\/em> – We constructed and maintained artificial burrow systems, enhanced potential foraging areas with native plants and structural features, and at the Alviso site we experimented with using high-salinity water to suppress weeds on the mounds used by owls. Overall, we helped enhance over 700 acres of Burrowing Owl habitat.<\/p>\n\n\n\n

\n\n\n\n

View Our Protocols, Data, and Findings<\/h2>\n\n\n\n

Click on the links below to view our data and reports. For information about our Burrowing Owl research and habitat restoration work or to discuss collaborations involving our data, please contact Science Director Katie LaBarbera at klabarbera@sfbbo.org<\/a>.<\/p>\n\n\n\n

Reports, Presentations, and Analysis<\/strong><\/em><\/p>\n\n\n\n