BirdAnalyst
Species · BCR 35 · BBS 2025 Release · 1966–2024

Zone-tailed Hawk In Chihuahuan Desert

All regionsChihuahuan DesertGeneralists

Zone-tailed Hawk in Chihuahuan Desert has fallen sharply: down 55% on the route-weighted index since 1999.

-55%Since 1999TrendPercent 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 →
9Routes 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 →
14YearsYears 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 →

Zone-tailed Hawk has fallen sharply in Chihuahuan Desert: down 55% on the route-weighted index since 1999.

Routes In Chihuahuan Desert

Routes recording Zone-tailed Hawk in Chihuahuan Desert.
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 →
CarrizozoNEW-MEXICO11968
Red RockNEW-MEXICO12024
ComstockTEXAS12008
Casa PiedraTEXAS12023
Bear MtnTEXAS11999
PresidioTEXAS12010
Devils R CynTEXAS12002
ToyahvaleTEXAS12019
PumpvilleTEXAS12019

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