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

Common Grackle In Central Mixed Grass Prairie

All regionsCentral Mixed Grass PrairieGeneralists

Common Grackle in Central Mixed Grass Prairie has edged down: down 23% on the route-weighted index since 1969.

-23%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 →
129Routes 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 →

No notable trend signals for Common Grackle in Central Mixed Grass Prairie. See the full index history below.

Common Grackle In Central Mixed Grass Prairie Population Forecast

If the recent trend holds, Common Grackle in Central Mixed Grass Prairie is projected to fall about 19% by 2029 — from 30 in 2024 to a central estimate of 25 (95% range 11–39). A 5-year backtest shows a typical error of ±13.6%, with 100% of held-out values landing inside the 95% band.

-19%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 →
25Projected 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 →
11–3995% 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 →
±13.6%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, Common Grackle in Central Mixed Grass Prairie is projected to fall about 19% by 2029 — from 30 in 2024 to a central estimate of 25 (95% range 11–39). A 5-year backtest shows a typical error of ±13.6%, 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 →
2025261240
2026261240
2027251139
2028251139
2029251139

Routes In Central Mixed Grass Prairie

Routes recording Common Grackle 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 →
KenesawNEBRASKA2082024
SumnerNEBRASKA1442024
SurpriseNEBRASKA1442024
BerwynNEBRASKA1122010
HamptonNEBRASKA1102024
CovertKANSAS972024
BelvidereNEBRASKA972024
StrattonNEBRASKA972024
Wheeler CoNEBRASKA922024
SargentNEBRASKA842024
PetersburgNEBRASKA782023
KearneyNEBRASKA722024
ColonyOKLAHOMA711995
Berwyn 2NEBRASKA652021
GrayKANSAS642019
MisslerKANSAS632019
Beloit 2KANSAS622018
MaxwellNEBRASKA582024
WellingtonKANSAS522024
BookerTEXAS512024
JohnstownNEBRASKA492024
Liberty 2NEBRASKA492007
TableNEBRASKA472024
ChapmanKANSAS461981
ChambersNEBRASKA452023

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