The Bay Why Are There So Many Crows in the Bay Area?
8 snips
Feb 20, 2026 A dive into why crow numbers have surged in the Bay Area since the 1970s and especially after 2000. Exploration of winter roosting behavior and why cities make inviting crow habitats. Discussion of how urban food, safety from persecution, and clever crow behavior drive population growth. Conversation about crow impacts on other birds and humane ways people manage conflicts.
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Why Crows Roost In Big Flocks
- Crows form large winter roosts for safety and social reasons, sharing food locations and sheltering together.
- Roost sites favor perches with predator visibility and protection from wind and rain.
Crow Numbers From The Christmas Bird Count
- Bob Lewis recounts Christmas bird count numbers showing a steady crow rise from 167 in 2000 to about 2,500 later on.
- The count covers Oakland and much of the East Bay and involves hundreds of volunteers.
Regional Variation And Broader Trends
- Crow increases vary regionally; South Bay declines linked to West Nile outbreaks while other areas rose sharply.
- Corvid population trends mirror broader western U.S. patterns, affecting crows and ravens alike.