Species · California · BBS 2025 Release · 1966–2024
Abert's Towhee Population Trend in California
Abert's Towhee in California has risen sharply: up 57% on the route-weighted index since 1974.
+57%Since 1974
10Routes In State
51Years
Notable Abert's Towhee Trends in California
long arc increasecomputed index
Abert's Towhee has risen sharply in California: up 57% on the route-weighted index since 1974.
Abert's Towhee Population Forecast in California
If the recent trend holds, Abert's Towhee in California is projected to fall about 32% by 2029 — from 0.11 in 2024 to a central estimate of 0.07 (95% range 0.00–0.17). A 5-year backtest shows a typical error of ±32.3%, with 100% of held-out values landing inside the 95% band.
-32%Change by 2029
0.07Projected 2029 index
0.00–0.1795% range
±32.3%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.07 | 0.00 | 0.17 |
| 2026 | 0.07 | 0.00 | 0.17 |
| 2027 | 0.07 | 0.00 | 0.17 |
| 2028 | 0.07 | 0.00 | 0.17 |
| 2029 | 0.07 | 0.00 | 0.17 |
Abert's Towhee Survey Routes in California
| Niland | 10 | 2024 | 1979 |
| Brawley | 9 | 2001 | 1976 |
| Parker Dam | 6 | 2007 | 1973 |
| Coachella Cn | 4 | 2000 | 2000 |
| Blythe | 4 | 1979 | 1979 |
| Imperial Dam | 3 | 2006 | 1973 |
| Glamis | 2 | 2017 | 1968 |
| Havasu Lake | 2 | 2003 | 1973 |
| Palo Verde | 1 | 2023 | 1973 |
| Alamo River | 1 | 1991 | 1973 |
Abert's Towhee Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.