BirdAnalyst
Species · Arizona · BBS 2025 Release · 1966–2024

Black-bellied Whistling-Duck Population Trend in Arizona

All statesWaterfowl

Black-bellied Whistling-Duck in Arizona has fallen sharply: down 54% on the route-weighted index since 1988.

-54%Since 1988TrendPercent 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 StateSurvey 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 Black-bellied Whistling-Duck Trends in ArizonaNotable 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 →

Black-bellied Whistling-Duck has fallen sharply in Arizona: down 54% on the route-weighted index since 1988.

Black-bellied Whistling-Duck Survey Routes in Arizona

Routes recording Black-bellied Whistling-Duck in Arizona.
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 →
Coolidge319751975
Amado220142006
Peña Blanca219971997
Patagonia120121970

Black-bellied Whistling-Duck Population Trend in Other States

alabamaarkansasfloridageorgiaindianalouisianamississippimissourinebraskaoklahomasouth-carolinatennesseetexas

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