Species · BCR 35 · BBS 2025 Release · 1966–2024
Vesper Sparrow In Chihuahuan Desert
Vesper Sparrow in Chihuahuan Desert has collapsed: down 93% on the route-weighted index since 1980.
-93%Since 1980
3Routes In Region
34Years
Notable Signals
long arc declinecomputed index
Vesper Sparrow has collapsed in Chihuahuan Desert: down 93% on the route-weighted index since 1980.
Forecast
If the recent trend holds, Vesper Sparrow in Chihuahuan Desert is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.53). A 5-year backtest shows a typical error of ±581.9%, with 100% of held-out values landing inside the 95% band.
n/aChange by 2029
0.00Projected 2029 index
0.00–0.5395% range
±581.9%Backtest error
| Year | Projected index | 95% low | 95% high |
|---|---|---|---|
| 2025 | 0.00 | 0.00 | 0.53 |
| 2026 | 0.00 | 0.00 | 0.53 |
| 2027 | 0.00 | 0.00 | 0.53 |
| 2028 | 0.00 | 0.00 | 0.53 |
| 2029 | 0.00 | 0.00 | 0.53 |
Routes In Chihuahuan Desert
| Carrizozo | NEW-MEXICO | 2 | 2021 |
| Capitan Mtn. | NEW-MEXICO | 1 | 2017 |
| Pinon | NEW-MEXICO | 1 | 2024 |
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.