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

Brewer's Blackbird In Eastern Tallgrass Prairie

All regionsEastern Tallgrass PrairieGeneralists

Brewer's Blackbird in Eastern Tallgrass Prairie has collapsed: down 78% on the route-weighted index since 1971.

-78%Since 1971
5Routes In Region
34Years

Notable Signals

long arc declinecomputed index

Brewer's Blackbird has collapsed in Eastern Tallgrass Prairie: down 78% on the route-weighted index since 1971.

Forecast

If the recent trend holds, Brewer's Blackbird in Eastern Tallgrass Prairie is projected to stay roughly flat through 2029, near 0.01 (95% range 0.00–0.07). A 5-year backtest shows a typical error of ±71.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.01Projected 2029 index
0.00–0.0795% range
±71.2%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.010.000.07
20260.010.000.07
20270.010.000.07
20280.010.000.07
20290.010.000.07

Routes In Eastern Tallgrass Prairie

Routes recording Brewer's Blackbird in Eastern Tallgrass Prairie.
Ash CreekMINNESOTA201985
River FallsWISCONSIN72013
RaymondWISCONSIN32024
FowlerINDIANA22021
LakevilleMINNESOTA22015

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