BirdAnalyst
Species · BCR 36 · BBS 2026 Release · 1966–2025

Greater Roadrunner In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsArid-land birds

Greater Roadrunner in Tamaulipan Brushlands has risen sharply: up 55% on the route-weighted index since 1969.

+55%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 →
27Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 increasecomputed 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 risen sharply in Tamaulipan Brushlands: up 55% on the route-weighted index since 1969.

Greater Roadrunner In Tamaulipan Brushlands Population Forecast

If the recent trend holds, Greater Roadrunner in Tamaulipan Brushlands is projected to fall about 14% by 2030 — from 5.1 in 2025 to a central estimate of 4.4 (95% range 1.6–7.2). A 5-year backtest shows a typical error of ±85.3%, with 80% of held-out values landing inside the 95% band.

-14%Change by 2030TrendPercent 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 →
4.4Projected 2030 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
1.6–7.295% 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 →
±85.3%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 Tamaulipan Brushlands is projected to fall about 14% by 2030 — from 5.1 in 2025 to a central estimate of 4.4 (95% range 1.6–7.2). A 5-year backtest shows a typical error of ±85.3%, with 80% of held-out values landing inside the 95% band.19672030
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 →
20264.31.47.1
20274.31.57.1
20284.31.57.1
20294.41.57.2
20304.41.67.2

Routes In Tamaulipan Brushlands

Routes recording Greater Roadrunner in Tamaulipan Brushlands.
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 →
Pedro CreekTEXAS202005
El SauzTEXAS132023
CatarinaTEXAS92010
Agua NuevaTEXAS72023
ZapataTEXAS71987
Mirando CityTEXAS72025
George WestTEXAS62025
Encinal 2TEXAS62025
Catarina 3TEXAS62025
RandadoTEXAS52025
La PryorTEXAS52010
RaymondvilleTEXAS52025
DilleyTEXAS52025
GuerraTEXAS52025
SejitaTEXAS52023
EncinalTEXAS42010
HondoTEXAS42025
Cavasara Cr.TEXAS42025
RachalTEXAS32025
San YgnacioTEXAS31985
Catarina 2TEXAS32017
El IndioTEXAS22001
KingsvilleTEXAS12024
ProgresoTEXAS12003
LaredoTEXAS12023

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.