Common Merganser
| Gender | male and female |
| Age | adult |
| Plumage | breeding plumage |
| Recorded | 2011-01-23 |
| Location | Aarburg, AG, CH |
| Copyright | Beat Rüegger |
| Gender | female |
| Age | 1st calendar year |
| Plumage | 1st winter |
| Recorded | 2011-12-18 |
| Location | Aarburg, AG, CH |
| Copyright | Beat Rüegger |
| Family | Swans, Geese and Ducks |
| Status CH | scarce breeding bird, regular migrant, regular winter visitor |
| References | en.wikipedia.org |
| vogelwarte.ch |
27 | 27