BirdAnalyst
Species · BCR 33 · BBS 2025 Release · 1966–2024

Ring-billed Gull In Sonoran and Mojave Deserts

All regionsSonoran and Mojave DesertsWetland birds

Ring-billed Gull in Sonoran and Mojave Deserts has collapsed: down 89% on the route-weighted index since 1976.

-89%Since 1976TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
6Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
16YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Ring-billed Gull has collapsed in Sonoran and Mojave Deserts: down 89% on the route-weighted index since 1976.

Routes In Sonoran and Mojave Deserts

Routes recording Ring-billed Gull in Sonoran and Mojave Deserts.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
BrawleyCALIFORNIA432009
LagunaARIZONA11975
Parker DamCALIFORNIA12007
NilandCALIFORNIA12021
Alamo RiverCALIFORNIA12017
Kelso ValleyCALIFORNIA11976

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.