BirdAnalyst
Species · BCR 21 · BBS 2025 Release · 1966–2024

Chihuahuan Raven In Oaks and Prairies

All regionsOaks and PrairiesGeneralists

Chihuahuan Raven in Oaks and Prairies has fallen sharply: down 54% on the route-weighted index since 1971.

-54%Since 1971TrendPercent 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 →
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 →

Chihuahuan Raven has fallen sharply in Oaks and Prairies: down 54% on the route-weighted index since 1971.

Routes In Oaks and Prairies

Routes recording Chihuahuan Raven in Oaks and Prairies.
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 →
AlbanyTEXAS32016
OlneyTEXAS22024
Whit Mtn.TEXAS22012
CampbelltonTEXAS12015
Lone OakTEXAS11993
CottonwoodTEXAS12012

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