BirdAnalyst
Species · BCR 5 · BBS 2025 Release · 1966–2024

Brown-headed Cowbird In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestGeneralists

Brown-headed Cowbird in Northern Pacific Rainforest has collapsed: down 76% on the route-weighted index since 1970.

-76%Since 1970
112Routes In Region
56Years

Notable Signals

long arc declinecomputed index

Brown-headed Cowbird has collapsed in Northern Pacific Rainforest: down 76% on the route-weighted index since 1970.

Forecast

If the recent trend holds, Brown-headed Cowbird in Northern Pacific Rainforest is projected to fall about 67% by 2029 — from 3.6 in 2024 to a central estimate of 1.2 (95% range 0.00–4.5). A 5-year backtest shows a typical error of ±55.1%, with 100% of held-out values landing inside the 95% band.

-67%Change by 2029
1.2Projected 2029 index
0.00–4.595% range
±55.1%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
20251.70.005.0
20261.60.004.9
20271.50.004.8
20281.30.004.6
20291.20.004.5

Routes In Northern Pacific Rainforest

Routes recording Brown-headed Cowbird in Northern Pacific Rainforest.
SalemOREGON322024
Horse CreekCALIFORNIA202019
Nicolai Mtn.OREGON202024
Port AngelesWASHINGTON202024
YrekaCALIFORNIA172019
GarfieldOREGON172023
EverettWASHINGTON152024
CoquilleOREGON142024
GreenOREGON142024
MukilteoWASHINGTON122024
South ElmaWASHINGTON112024
Bay ViewWASHINGTON112017
ElktonOREGON102024
Emigrant LkOREGON102001
IssaquahWASHINGTON101987
Mendota 3WASHINGTON102024
HoneydewCALIFORNIA92017
SvensenOREGON91992
ScappooseOREGON92023
MendotaWASHINGTON91988
Rio DellCALIFORNIA82011
AlderpointCALIFORNIA82012
AdairOREGON82024
DaytonOREGON82024
Sams ValleyOREGON82024

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