| Observation | Date | Location | Number of Birds | Data Source |
|---|---|---|---|---|
| Data | 2000-04-21 | Kesterson NWR- Freitas Units | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-21 | Big Bottom Dairy | 0 | Statewide Survey, 2000 (unpublished) |
| Data | 2000-04-21 | Nunes & Sons Dairy | 500 | Statewide Survey, 2000 (unpublished) |