Gull-billed Tern
| Gender | undetermined |
| Age | adult |
| Plumage | breeding plumage |
| Recorded | 2005-04-16 |
| Location | Ebrodelta, E |
| Copyright | Beat Rüegger |
| Gender | undetermined |
| Age | adult |
| Plumage | breeding plumage |
| Recorded | 2017-07-26 |
| Location | Villanueva del Fresno, ES |
| Copyright | Beat Rüegger |
| Family | Terns |
| Status CH | irregular visitor |
| References | en.wikipedia.org |
| vogelwarte.ch |
10 | 13