BirdAnalyst
Species · BCR 34 · BBS 2025 Release · 1966–2024

Rivoli's Hummingbird In Sierra Madre Occidental

All regionsSierra Madre OccidentalGeneralists

Rivoli's Hummingbird in Sierra Madre Occidental has collapsed: down 77% on the route-weighted index since 1983.

-77%Since 1983TrendPercent 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 →
4Routes 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 →
15YearsYears 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 →

Rivoli's Hummingbird has collapsed in Sierra Madre Occidental: down 77% on the route-weighted index since 1983.

Routes In Sierra Madre Occidental

Routes recording Rivoli's Hummingbird in Sierra Madre Occidental.
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 →
PatagoniaARIZONA11983
SunizonaARIZONA11986
Mt. GrahamARIZONA12023
PortalARIZONA12024

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