BirdAnalyst
Species · BCR 36 · BBS 2025 Release · 1966–2024

Yellow-billed Cuckoo In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGeneralists

Yellow-billed Cuckoo in Tamaulipan Brushlands has edged up: up 16% on the route-weighted index since 1969.

+16%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 →
57YearsYears 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 →

No notable trend signals for Yellow-billed Cuckoo in Tamaulipan Brushlands. See the full index history below.

Forecast

If the recent trend holds, Yellow-billed Cuckoo in Tamaulipan Brushlands is projected to fall about 44% by 2029 — from 6.8 in 2024 to a central estimate of 3.8 (95% range 0.60–7.1). A 5-year backtest shows a typical error of ±38.2%, with 60% of held-out values landing inside the 95% band.

-44%Change by 2029TrendPercent 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 →
3.8Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.60–7.195% 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 →
±38.2%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, Yellow-billed Cuckoo in Tamaulipan Brushlands is projected to fall about 44% by 2029 — from 6.8 in 2024 to a central estimate of 3.8 (95% range 0.60–7.1). A 5-year backtest shows a typical error of ±38.2%, with 60% of held-out values landing inside the 95% band.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 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 →
20254.00.747.2
20264.00.717.2
20273.90.677.2
20283.90.647.1
20293.80.607.1

Routes In Tamaulipan Brushlands

Routes recording Yellow-billed Cuckoo 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 →
KingsvilleTEXAS172024
HondoTEXAS152024
SejitaTEXAS122024
El IndioTEXAS112007
GuerraTEXAS112023
ZapataTEXAS101987
George WestTEXAS82024
Encinal 2TEXAS72024
CatarinaTEXAS62010
La PryorTEXAS62005
RaymondvilleTEXAS62024
Cavasara Cr.TEXAS62023
Mirando CityTEXAS52024
Millett 2TEXAS52024
Agua NuevaTEXAS42023
El SauzTEXAS42023
MillettTEXAS42010
EncinalTEXAS32010
San YgnacioTEXAS31985
Catarina 3TEXAS32024
RandadoTEXAS22024
DilleyTEXAS22024
ProgresoTEXAS22011
RachalTEXAS12023
Catarina 2TEXAS12014

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