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

House Sparrow Population Trend in Alabama

All statesGeneralists

House Sparrow in Alabama has collapsed: down 95% on the route-weighted index since 1968.

-95%Since 1968TrendPercent 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 →
97Routes 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 →
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 House Sparrow Trends in AlabamaNotable 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 →

House Sparrow has collapsed in Alabama: down 95% on the route-weighted index since 1968.

House Sparrow Population Forecast in Alabama

If the recent trend holds, House Sparrow in Alabama is projected to fall about 100% by 2029 — from 2.8 in 2024 to a central estimate of 0.00 (95% range 0.00–17). A 5-year backtest shows a typical error of ±684.5%, with 20% of held-out values landing inside the 95% band.

-100%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 →
0.00Projected 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 →
0.00–1795% 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 →
±684.5%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, House Sparrow in Alabama is projected to fall about 100% by 2029 — from 2.8 in 2024 to a central estimate of 0.00 (95% range 0.00–17). A 5-year backtest shows a typical error of ±684.5%, with 20% of held-out values landing inside the 95% band.19662029
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 →
20250.000.0017
20260.000.0017
20270.000.0017
20280.000.0017
20290.000.0017

House Sparrow Survey Routes in Alabama

Routes recording House Sparrow in Alabama.
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 →
Birmingham19219951969
Summitt5219811966
Foley4719841966
Hillsboro3519961966
Alabama Pt3220031966
Guntersville2720241980
Rock Chapel2720242017
Dawson2519981966
Dearmanville2319831966
Lakeview2120241999
Alabama Pt 22020192004
Carter Grove1120232002
Escatawpa1019891983
Greensport920241966
Vernon920161996
Swaim820241966
Warrior Std720061966
Newton720241966
Calebee720131994
Elberta720211986
Oneonta720231996
Millerville620021966
Grove Hill620231983
Stevenson620241996
Wedgeworth520211979

House Sparrow Population Trend in Other States

alaskaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming

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