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Species · Wyoming · BBS 2025 Release · 1966–2024

Black-billed Magpie Population Trend in Wyoming

All statesGeneralists

Black-billed Magpie in Wyoming has declined: down 29% on the route-weighted index since 1970.

-29%Since 1970
118Routes In State
56Years

Notable Black-billed Magpie Trends in Wyoming

No notable trend signals for Black-billed Magpie in Wyoming. See the full index history below.

Black-billed Magpie Population Forecast in Wyoming

If the recent trend holds, Black-billed Magpie in Wyoming is projected to fall about 45% by 2029 — from 8.0 in 2024 to a central estimate of 4.4 (95% range 0.00–10). A 5-year backtest shows a typical error of ±47.9%, with 100% of held-out values landing inside the 95% band.

-45%Change by 2029
4.4Projected 2029 index
0.00–1095% range
±47.9%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
20254.70.0011
20264.60.0010
20274.60.0010
20284.50.0010
20294.40.0010

Black-billed Magpie Survey Routes in Wyoming

Routes recording Black-billed Magpie in Wyoming.
Boulder11220241982
Meeteetse7220241991
Carter6820162006
Cody4820241983
Green River4419841977
Mtn View3620241980
Fontenelle3320241982
Riverside2920241968
Harmony2720232009
Crowheart2220211987
Carter 22120242017
Ethete1920241991
Sybille Cyn1820241980
Savery1719951989
Walcott1620241982
Wyarno1420241974
Dubois1420241968
Gebo1420241980
Warbonnet1420242008
Lovell1320241989
Arvada1320241997
Anchor1320181993
Ne Entrance1220211982
Cumberland1220241977
Dayton1220241980

Black-billed Magpie Population Trend in Other States

alaskaarizonacaliforniacoloradoidahokansasminnesotamontananebraskanevadanew-mexiconorth-dakotaoklahomaoregonsouth-dakotautahwashington

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