BirdAnalyst
Species · Louisiana · BBS 2025 Release · 1966–2024

Greater Roadrunner Population Trend in Louisiana

All statesArid-land birds

Greater Roadrunner in Louisiana has fallen sharply: down 63% on the route-weighted index since 1969.

-63%Since 1969TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
20Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
36YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Greater Roadrunner Trends in LouisianaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc declinecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Greater Roadrunner has fallen sharply in Louisiana: down 63% on the route-weighted index since 1969.

Greater Roadrunner Population Forecast in Louisiana

If the recent trend holds, Greater Roadrunner in Louisiana is projected to stay roughly flat through 2021, near 0.02 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±69.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2021TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →
0.02Projected 2021 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.1395% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±69.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Greater Roadrunner in Louisiana is projected to stay roughly flat through 2021, near 0.02 (95% range 0.00–0.13). A 5-year backtest shows a typical error of ±69.4%, with 100% of held-out values landing inside the 95% band.19672021
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20170.030.000.14
20180.030.000.14
20190.020.000.13
20200.020.000.13
20210.020.000.13

Greater Roadrunner Survey Routes in Louisiana

Routes recording Greater Roadrunner in Louisiana.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Easton219901990
Clay220131985
Flat Creek220151999
Fort Jessup119981998
Ivan120002000
De Ridder120151968
Derry119751967
Cypress119701970
Fort Polk119741970
Longstreet120091967
Fillmore119691969
Many119921992
De Quincy120072007
Zwolle119991999
Mount Union120101999
Womack120062001
Natchez119961995
Ivan 2120162016
Oakdale119931993
Burr Ferry120161988

Greater Roadrunner Population Trend in Other States

arizonaarkansascaliforniacoloradokansasmissourinevadanew-mexicooklahomatexasutah

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