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

Elf Owl In Sierra Madre Occidental

All regionsSierra Madre OccidentalGeneralists

Elf Owl in Sierra Madre Occidental has fallen sharply: down 70% on the route-weighted index since 1986.

-70%Since 1986TrendPercent 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 →
5Routes 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 →
13YearsYears 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 →

Elf Owl has fallen sharply in Sierra Madre Occidental: down 70% on the route-weighted index since 1986.

Routes In Sierra Madre Occidental

Routes recording Elf Owl 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 →
Peña BlancaARIZONA12006
PatagoniaARIZONA12005
Bartlett ResARIZONA12007
RedingtonARIZONA12023
Carr MtnARIZONA12021

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