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Species · BCR 19 · BBS 2025 Release · 1966–2024

Warbling Vireo In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieForest birds

Warbling Vireo in Central Mixed Grass Prairie has surged: up 162% on the route-weighted index since 1969.

+162%Since 1969TrendPercent 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 →
96Routes 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 →
57YearsYears 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 increasecomputed 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 →

Warbling Vireo has surged in Central Mixed Grass Prairie: up 162% on the route-weighted index since 1969.

Warbling Vireo In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Warbling Vireo in Central Mixed Grass Prairie is projected to rise about 30% by 2029 — from 1.9 in 2024 to a central estimate of 2.5 (95% range 1.9–3.1). A 5-year backtest shows a typical error of ±15%, with 100% of held-out values landing inside the 95% band.

+30%Change by 2029TrendPercent 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 →
2.5Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.9–3.195% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±15%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Warbling Vireo in Central Mixed Grass Prairie is projected to rise about 30% by 2029 — from 1.9 in 2024 to a central estimate of 2.5 (95% range 1.9–3.1). A 5-year backtest shows a typical error of ±15%, with 100% of held-out values landing inside the 95% band.19672029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20252.41.83.0
20262.41.83.1
20272.51.83.1
20282.51.83.1
20292.51.93.1

Routes In Central Mixed Grass Prairie

Routes recording Warbling Vireo in Central Mixed Grass Prairie.
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 →
KearneyNEBRASKA132024
LoganKANSAS122022
ChambersNEBRASKA122023
HanoverKANSAS112023
Red CloudNEBRASKA112024
BelvidereNEBRASKA102024
MinneapolisKANSAS92019
CovertKANSAS92024
Wheeler CoNEBRASKA92024
AlmeriaNEBRASKA82021
KanopolisKANSAS72024
SolomonKANSAS72019
SumnerNEBRASKA72024
SurpriseNEBRASKA72024
BoelusNEBRASKA72022
BerwetKANSAS62024
Beloit 2KANSAS62018
HamptonNEBRASKA62024
BuckeyeKANSAS52023
JewellKANSAS52005
KenesawNEBRASKA52024
WellingtonKANSAS42024
DaltonKANSAS42024
HollenbergKANSAS42023
JamestownKANSAS42024

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