Species · Iowa · BBS 2025 Release · 1966–2024
Loggerhead Shrike Population Trend in Iowa
Loggerhead Shrike in Iowa has collapsed: down 86% on the route-weighted index since 1969.
-86%Since 1969
34Routes In State
51Years
Notable Loggerhead Shrike Trends in Iowa
long arc declinecomputed index
Loggerhead Shrike has collapsed in Iowa: down 86% on the route-weighted index since 1969.
Loggerhead Shrike Population Forecast in Iowa
If the recent trend holds, Loggerhead Shrike in Iowa is projected to stay roughly flat through 2027, near 0.00 (95% range 0.00–0.49). A 5-year backtest shows a typical error of ±94.2%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2027
0.00Projected 2027 index
0.00–0.4995% range
±94.2%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2023 | 0.01 | 0.00 | 0.50 |
| 2024 | 0.00 | 0.00 | 0.49 |
| 2025 | 0.00 | 0.00 | 0.49 |
| 2026 | 0.00 | 0.00 | 0.49 |
| 2027 | 0.00 | 0.00 | 0.49 |
Loggerhead Shrike Survey Routes in Iowa
| Panther | 4 | 1994 | 1971 |
| Rock Valley | 4 | 1982 | 1982 |
| College Spgs | 3 | 2004 | 1967 |
| Pierson | 3 | 2003 | 1968 |
| Bedford | 2 | 2010 | 1968 |
| Bryant | 2 | 1994 | 1994 |
| Wales | 2 | 2013 | 1967 |
| Hudson | 2 | 1992 | 1969 |
| Zearing | 2 | 1994 | 1968 |
| Scranton | 2 | 1997 | 1983 |
| Davis Corner | 2 | 1994 | 1994 |
| Garner | 2 | 1989 | 1989 |
| Mccallsburg | 2 | 2012 | 1997 |
| Mt Hamill | 1 | 2005 | 1970 |
| Exline | 1 | 2009 | 1974 |
| Melrose | 1 | 2011 | 1976 |
| West Liberty | 1 | 1994 | 1970 |
| Burchinal | 1 | 1995 | 1995 |
| Brooklyn | 1 | 2007 | 1969 |
| Williamsburg | 1 | 2017 | 1967 |
| Red Rock | 1 | 2005 | 1969 |
| Desmoines | 1 | 1972 | 1968 |
| Washington | 1 | 1993 | 1967 |
| Neola | 1 | 2006 | 1968 |
| Maquoketa | 1 | 2004 | 2004 |
Loggerhead Shrike Population Trend in Other States
alabamaarizonaarkansascaliforniacoloradofloridageorgiaidahoillinoisindianakansaskentuckylouisianamainemarylandmichiganminnesotamississippimissourimontananebraskanevadanew-mexiconew-yorknorth-carolinanorth-dakotaohiooklahomaoregonpennsylvaniasouth-carolinasouth-dakotatennesseetexasutahvermontvirginiawashingtonwest-virginiawisconsinwyoming
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.