BirdAnalyst
Species · BCR 17 · BBS 2025 Release · 1966–2024

Chestnut-collared Longspur In Badlands and Prairies

All regionsBadlands and PrairiesGeneralists

Chestnut-collared Longspur in Badlands and Prairies has collapsed: down 77% on the route-weighted index since 1969.

-77%Since 1969
74Routes In Region
57Years

Notable Signals

long arc declinecomputed index

Chestnut-collared Longspur has collapsed in Badlands and Prairies: down 77% on the route-weighted index since 1969.

Forecast

If the recent trend holds, Chestnut-collared Longspur in Badlands and Prairies is projected to fall about 100% by 2029 — from 8.3 in 2024 to a central estimate of 0.00 (95% range 0.00–17). A 5-year backtest shows a typical error of ±184.8%, with 100% of held-out values landing inside the 95% band.

-100%Change by 2029
0.00Projected 2029 index
0.00–1795% range
±184.8%Backtest error
19672029
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
20250.000.0017
20260.000.0017
20270.000.0017
20280.000.0017
20290.000.0017

Routes In Badlands and Prairies

Routes recording Chestnut-collared Longspur in Badlands and Prairies.
Dinosaurs H.M.MONTANA1232024
LodgepoleSOUTH-DAKOTA942024
RoundupMONTANA712024
Cedar CreekNORTH-DAKOTA692022
Coleman CouleeMONTANA682023
RevaSOUTH-DAKOTA402024
CarsonNORTH-DAKOTA382024
AlbionMONTANA342024
WebsterMONTANA292024
Dunn CenterNORTH-DAKOTA272024
ZapNORTH-DAKOTA242024
DickinsonNORTH-DAKOTA202024
GolvaNORTH-DAKOTA172023
CircleMONTANA162023
Ft YatesNORTH-DAKOTA162004
BowmanNORTH-DAKOTA162024
Glen UllinNORTH-DAKOTA142022
LarkNORTH-DAKOTA121982
SolenNORTH-DAKOTA122024
FlatwillowMONTANA82006
Jordan SouthMONTANA82024
Wheat BasinMONTANA82024
MaurineSOUTH-DAKOTA82024
Pine TreeWYOMING81995
BentleyNORTH-DAKOTA72024

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