BirdAnalyst
Species · BCR 22 · BBS 2025 Release · 1966–2024

Sora In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieWetland birds

Sora in Eastern Tallgrass Prairie has fallen sharply: down 59% on the route-weighted index since 1969.

-59%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 →
21Routes 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 →
35YearsYears 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 Sora in Eastern Tallgrass Prairie. See the full index history below.

Sora In Eastern Tallgrass Prairie Population Forecast

If the recent trend holds, Sora in Eastern Tallgrass Prairie is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.03). A 5-year backtest shows a typical error of ±61.5%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2027TrendPercent 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 →
0.00Projected 2027 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0395% 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 →
±61.5%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, Sora in Eastern Tallgrass Prairie is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.03). A 5-year backtest shows a typical error of ±61.5%, with 100% of held-out values landing inside the 95% band.19662027
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 →
20230.010.000.03
20240.010.000.03
20250.000.000.03
20260.000.000.03
20270.000.000.03

Routes In Eastern Tallgrass Prairie

Routes recording Sora in Eastern Tallgrass 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 →
CubaINDIANA22021
RichlandNEBRASKA22019
BartonvilleILLINOIS11973
ClarksdaleILLINOIS11981
Troy GroveILLINOIS11996
SenecaILLINOIS12015
KeithsburgILLINOIS12010
SterlingILLINOIS12019
EubanksILLINOIS12006
FairdaleILLINOIS12019
Kankakee SandsINDIANA12022
ExlineIOWA11992
HudsonIOWA11983
PiersonIOWA11969
Sioux CityIOWA12011
OlsburgKANSAS12011
Ash CreekMINNESOTA11995
LakevilleMINNESOTA11992
AustinMINNESOTA12011
ThurstonNEBRASKA11999
RaymondWISCONSIN12022

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