BirdAnalyst
Species · BCR 21 · BBS 2025 Release · 1966–2024

Neotropic Cormorant In Oaks and Prairies

All regionsOaks and PrairiesWetland birds

Neotropic Cormorant in Oaks and Prairies has surged: up 345% on the route-weighted index since 2005.

+345%Since 2005TrendPercent 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 →
6Routes 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 →
18YearsYears 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 →

Neotropic Cormorant has surged in Oaks and Prairies: up 345% on the route-weighted index since 2005.

Neotropic Cormorant In Oaks and Prairies Population Forecast

If the recent trend holds, Neotropic Cormorant in Oaks and Prairies is projected to stay roughly flat through 2029, near 0.24 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±132.3%, with 80% of held-out values landing inside the 95% band.

+3%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 →
0.24Projected 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 →
0.00–0.5395% 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 →
±132.3%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, Neotropic Cormorant in Oaks and Prairies is projected to stay roughly flat through 2029, near 0.24 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±132.3%, with 80% of held-out values landing inside the 95% band.19772029
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 →
20250.220.000.51
20260.220.000.52
20270.230.000.52
20280.230.000.53
20290.240.000.53

Routes In Oaks and Prairies

Routes recording Neotropic Cormorant in Oaks and Prairies.
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 →
CampbelltonTEXAS102016
Massey LakeTEXAS42024
BonnerTEXAS42024
SadlerTEXAS32024
RhomeTEXAS22021
SeldenTEXAS12021

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