BirdAnalyst
Species · BCR 22 · BBS 2026 Release · 1966–2025

Bewick's Wren In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieForest birds

Bewick's Wren in Eastern Tallgrass Prairie has declined: down 28% on the route-weighted index since 1968.

-28%Since 1968TrendPercent 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 →
43Routes 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 Bewick's Wren in Eastern Tallgrass Prairie. See the full index history below.

Bewick's Wren In Eastern Tallgrass Prairie Population Forecast

If the recent trend holds, Bewick's Wren in Eastern Tallgrass Prairie is projected to stay roughly flat through 2030, near 0.05 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±331.8%, with 100% of held-out values landing inside the 95% band.

-10%Change by 2030TrendPercent 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 →
0.05Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1295% 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 →
±331.8%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, Bewick's Wren in Eastern Tallgrass Prairie is projected to stay roughly flat through 2030, near 0.05 (95% range 0.00–0.12). A 5-year backtest shows a typical error of ±331.8%, with 100% of held-out values landing inside the 95% band.19662030
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 →
20260.050.000.13
20270.050.000.12
20280.050.000.12
20290.050.000.12
20300.050.000.12

Routes In Eastern Tallgrass Prairie

Routes recording Bewick's Wren 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 →
ReeceKANSAS52025
TrentonMISSOURI41967
FilleyMISSOURI32024
UnionMISSOURI31999
LincolnvilleKANSAS22023
WashingtonMISSOURI21976
OhioMISSOURI22006
WatsonMISSOURI22021
GeraldMISSOURI22025
ConcordILLINOIS11991
ColumbiaILLINOIS11966
EubanksILLINOIS12015
Mt HamillIOWA12017
HumboldtKANSAS11991
LaplandKANSAS12017
DoverKANSAS11998
BarclayKANSAS11999
WrefordKANSAS12023
EllinorKANSAS12007
LongtonKANSAS12019
Le LoupKANSAS12018
OlsburgKANSAS12023
RensselaerMISSOURI11975
WarrenMISSOURI11969
MadisonMISSOURI12005

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.