Slender-billed Gull
| Gender | undetermined |
| Age | adult |
| Plumage | adult plumage |
| Recorded | 2018-04-08 |
| Location | Camcargue 13, FR |
| Copyright | Beat Rüegger |
| Gender | undetermined |
| Age | adult |
| Plumage | non-breeding plumage |
| Recorded | 2014-02-05 |
| Location | Sanlucar de Barameda, ES |
| Copyright | Beat Rüegger |
| Gender | undetermined |
| Age | 2nd calendar year |
| Plumage | 1st summer |
| Recorded | 2005-04-15 |
| Location | Ebrodelta, E |
| Copyright | Beat Rüegger |
| Family | Gulls |
| Status CH | irregular visitor |
| References | en.wikipedia.org |
| vogelwarte.ch |
31 | 64