BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Green Heron In Shortgrass Prairie

All regionsShortgrass PrairieWetland birds

Green Heron in Shortgrass Prairie has collapsed: down 88% on the route-weighted index since 1978.

-88%Since 1978TrendPercent 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 →
9Routes 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 →
25YearsYears 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 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 →

Green Heron has collapsed in Shortgrass Prairie: down 88% on the route-weighted index since 1978.

Green Heron In Shortgrass Prairie Population Forecast

If the recent trend holds, Green Heron in Shortgrass Prairie is projected to stay roughly flat through 2024, near 0.00 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±97.4%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024TrendPercent 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 →
0.00Projected 2024 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.00–0.0995% 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 →
±97.4%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, Green Heron in Shortgrass Prairie is projected to stay roughly flat through 2024, near 0.00 (95% range 0.00–0.09). A 5-year backtest shows a typical error of ±97.4%, with 100% of held-out values landing inside the 95% band.19682024
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 →
20200.000.000.09
20210.000.000.09
20220.000.000.09
20230.000.000.09
20240.000.000.09

Routes In Shortgrass Prairie

Routes recording Green Heron in Shortgrass Prairie.
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 →
CircleTEXAS91977
ClaytonvilleTEXAS42001
PostTEXAS22019
Cooley LakeNEW-MEXICO11994
MaxwellNEW-MEXICO12005
HardestyOKLAHOMA11983
Clear LakeOKLAHOMA12013
ChanningTEXAS11986
DoughertyTEXAS12009

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