BirdAnalyst
Species · BCR 23 · BBS 2025 Release · 1966–2024

Green-winged Teal In Prairie Hardwood Transition

All regionsPrairie Hardwood TransitionWaterfowl

Green-winged Teal in Prairie Hardwood Transition has held roughly steady: down 10% on the route-weighted index since 1970.

-10%Since 1970TrendPercent 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 →
32Routes 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 →
40YearsYears 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 Green-winged Teal in Prairie Hardwood Transition. See the full index history below.

Green-winged Teal In Prairie Hardwood Transition Population Forecast

If the recent trend holds, Green-winged Teal in Prairie Hardwood Transition is projected to stay roughly flat through 2027, near 0.02 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±52.1%, 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 →
0.02Projected 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 →
0.00–0.0595% 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 →
±52.1%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, Green-winged Teal in Prairie Hardwood Transition is projected to stay roughly flat through 2027, near 0.02 (95% range 0.00–0.05). A 5-year backtest shows a typical error of ±52.1%, 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 →
20230.020.000.06
20240.020.000.06
20250.020.000.06
20260.020.000.05
20270.020.000.05

Routes In Prairie Hardwood Transition

Routes recording Green-winged Teal in Prairie Hardwood Transition.
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 →
DresserWISCONSIN32016
Beaver DamWISCONSIN32008
Packertown 2INDIANA22017
LawrenceMICHIGAN21978
GalesburgMICHIGAN21994
HatfieldWISCONSIN21982
ElderonWISCONSIN21985
StetsonvilleWISCONSIN22002
NashvilleMICHIGAN11968
Chippewa Lk.MICHIGAN12004
MinnetonkaMINNESOTA12000
PrincetonMINNESOTA11985
OsseoMINNESOTA11971
KnappMINNESOTA11993
EdwardsMINNESOTA12000
EvergreenMINNESOTA11996
AshbyMINNESOTA12019
Sherburne NrMINNESOTA12005
LoraineWISCONSIN12009
CumberlandWISCONSIN11993
WeyerhauserWISCONSIN12018
MatherWISCONSIN12010
Wis RapidsWISCONSIN12022
Stevens PtWISCONSIN12008
ManawaWISCONSIN12004

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