Migration & timing
Bonaparte's Gull in California
There aren't yet enough observations of Bonaparte's Gull in California to describe its timing with confidence.
Sighting 13 observations in California
Check back as more observations come in, or explore Bonaparte's Gull across North America.
Bonaparte's Gull elsewhere
More birds in California
Data: iNaturalist research-grade observations (CC0 / CC-BY), via GBIF. Excludes eBird.