Species · Kansas · BBS 2025 Release · 1966–2024
Black-crowned Night Heron Population Trend in Kansas
Black-crowned Night Heron in Kansas has collapsed: down 90% on the route-weighted index since 1969.
-90%Since 1969
20Routes In State
52Years
Notable Black-crowned Night Heron Trends in Kansas
long arc declinecomputed index
Black-crowned Night Heron has collapsed in Kansas: down 90% on the route-weighted index since 1969.
Black-crowned Night Heron Population Forecast in Kansas
If the recent trend holds, Black-crowned Night Heron in Kansas is projected to fall about 100% by 2028 — from 0.18 in 2023 to a central estimate of 0.00 (95% range 0.00–3.2). A 5-year backtest shows a typical error of ±170.2%, with 100% of held-out values landing inside the 95% band.
-100%Change by 2028
0.00Projected 2028 index
0.00–3.295% range
±170.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2024 | 0.02 | 0.00 | 3.2 |
| 2025 | 0.00 | 0.00 | 3.2 |
| 2026 | 0.00 | 0.00 | 3.2 |
| 2027 | 0.00 | 0.00 | 3.2 |
| 2028 | 0.00 | 0.00 | 3.2 |
Black-crowned Night Heron Survey Routes in Kansas
| Grigston | 7 | 2008 | 2001 |
| Leoti | 5 | 2003 | 2003 |
| Albert | 3 | 2023 | 1967 |
| Galesburg | 2 | 1985 | 1985 |
| Wellington | 1 | 2023 | 1979 |
| Dalton | 1 | 2017 | 1988 |
| St John | 1 | 1999 | 1972 |
| Coats | 1 | 1975 | 1974 |
| Coldwater | 1 | 2004 | 1999 |
| Olathe | 1 | 1990 | 1990 |
| Ellinor | 1 | 2004 | 2004 |
| Kanopolis | 1 | 1996 | 1996 |
| Phillipsburg | 1 | 2007 | 2007 |
| Gove | 1 | 1977 | 1977 |
| Missler | 1 | 1994 | 1982 |
| Berwet | 1 | 2006 | 2005 |
| Plymell | 1 | 2023 | 2008 |
| Olsburg | 1 | 2009 | 2007 |
| Winona | 1 | 2016 | 2016 |
| Solomon | 1 | 1996 | 1996 |
Black-crowned Night Heron Population Trend in Other States
alabamaarizonaarkansascaliforniacoloradoconnecticutdelawarefloridageorgiaidahoillinoisindianaiowakentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourimontananebraskanevadanew-hampshirenew-jerseynew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniarhode-islandsouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.