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

MacGillivray's Warbler In Sierra Madre Occidental

All regionsSierra Madre OccidentalForest birds

MacGillivray's Warbler in Sierra Madre Occidental has increased: up 27% on the route-weighted index since 1998.

+27%Since 1998TrendPercent 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 →
17YearsYears 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 →

No notable trend signals for MacGillivray's Warbler in Sierra Madre Occidental. See the full index history below.

Routes In Sierra Madre Occidental

Routes recording MacGillivray's Warbler 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 →
ReserveNEW-MEXICO22021
AlpineARIZONA12023
Mt. GrahamARIZONA12022
SprucedaleARIZONA12010

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