Community Science in an Urban Park
By Noreen Weeden
The Bison Paddock in Golden Gate Park sounds like an unlikely site for a community science project, but indeed it is. Golden Gate Bird Alliance (GGBA) volunteers and the San Francisco Park and Recreation Department (SFRPD) have partnered on a project for Tree Swallows and Western Bluebirds. Since 2009, GGBA and SFRPD have been supporting habitat for native birds at the Bison Paddock. Over the last 10 years, this project has presented opportunities and challenges.
The Bison Paddock is the largest local meadow habitat in the park with nearby freshwater (Chain of Lakes). Every spring the park blooms with biodiversity, where native plants attract insects, which in turn brings birds back to the area.
Our story begins with Tyler Lorillo, a Boy Scout who was interested in local, nesting birds and contacted GGBA. After getting in touch GGBA, he proposed to work with 6 other scouts to build and install nest boxes. The GGBA connected Tyler with Gloria Koch-Gonzales, then Manager of Golden Gate Park, and Josiah Clark of Habitat Potential regarding the Bison Paddock site. At the time, 2 Western Bluebird and 6 Tree Swallow nest boxes were recommended.
Under Cornell University’s Lab of Ornithology, Tree Swallows and Western Bluebirds are identified as Western Focal bird species, meaning there is a lack of information regarding these birds. NestWatch is a nationwide monitoring program designed to track status and trends in the reproductive biology of birds. Volunteers in many places record important data including when nesting occurs, number of eggs laid versus the number of eggs hatched, and how many hatchlings survive. Their database is intended to be used to study the current condition of breeding bird populations and how they may be changing over time as a result of climate change, habitat degradation and loss, expansion of urban areas, and the introduction of non-native plants and animals. Cornell’s NestWatch program allows community scientists the opportunity to learn how to monitor and collect data. Throughout the 10-year project, NestWatch’s data formatting has been used to monitor the Tree Swallows in the bison paddock.
Tree Swallow by Noreen Weeden
Both Tree Swallows and Western Bluebirds nest in the cavities of decaying trees. In Golden Gate Park, and in other parts of the City dead and decaying trees are removed due to potential danger to the public or property. The consequence of this safety measure means that the cavity-nesting birds have fewer places to build a nest.…

Ruddy Duck by Angie Geiger
Bird tour at Lake Merced by Angie Geiger
Black-crowned Night-Heron (the official bird of Oakland) by Jerry Ting
Black Phoebe by Carree Michel
One of many examples of GGBA’s community outreach. Here, Salesforce volunteers collaborate with GGBA to help restore Pier 94. Photo by Janet Carpinelli
Christmas Bird Count 2019. Volunteers admiring both the landscape and birds. Photo by Chris Okon