BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Brewer's Blackbird In Shortgrass Prairie

All regionsShortgrass PrairieGeneralists

Brewer's Blackbird in Shortgrass Prairie has collapsed: down 88% on the route-weighted index since 1970.

-88%Since 1970
61Routes In Region
55Years

Notable Signals

long arc declinecomputed index

Brewer's Blackbird has collapsed in Shortgrass Prairie: down 88% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Brewer's Blackbird in Shortgrass Prairie is projected to fall about 31% by 2029 — from 0.29 in 2024 to a central estimate of 0.20 (95% range 0.00–4.0). A 5-year backtest shows a typical error of ±37.2%, with 100% of held-out values landing inside the 95% band.

-31%Change by 2029
0.20Projected 2029 index
0.00–4.095% range
±37.2%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
20250.460.004.2
20260.390.004.1
20270.330.004.1
20280.260.004.0
20290.200.004.0

Routes In Shortgrass Prairie

Routes recording Brewer's Blackbird in Shortgrass Prairie.
BriggsdaleCOLORADO352008
KiowaCOLORADO292018
BereaNEBRASKA182017
ElbertCOLORADO112024
Kiowa 2COLORADO102023
CrawfordNEBRASKA92019
Pine RidgeNEBRASKA82002
GilpinCOLORADO71984
BennettCOLORADO72017
Prospect ValCOLORADO62000
NeegrandeCOLORADO62019
NunnCOLORADO62006
Murray LakeNEBRASKA62024
Wagon MoundNEW-MEXICO61971
Cooley LakeNEW-MEXICO61976
PinneoCOLORADO51977
AbarrCOLORADO52023
Adams Co.COLORADO52022
VillegreenCOLORADO52000
HardestyOKLAHOMA51988
YoderWYOMING52023
Pine BluffWYOMING52023
Two ButtesCOLORADO42013
Wildhorse LCOLORADO42015
EdisonCOLORADO42024

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