Willow Warbler
| Gender | undetermined |
| Age | undetermined |
| Plumage | undetermined |
| Recorded | 2021-05-15 |
| Location | Rothrist AG, CH |
| Copyright | Beat Rüegger |
| Family | Warblers |
| Status CH | regular breeding bird, common migrant, summer visitor |
| References | en.wikipedia.org |
| vogelwarte.ch |
99 | 129