Greylag Goose
Anser anser

Greylag Geese are the most common of the grey geese and are also well known as their domestic form, which can often be found feral. In most of Europe, they are the only grey goose you are likely to find in Summer.
 

1-2: River Aare, Dählhölzli, Bern, 21/04/2007.
3:River Aare, Dählhölzli, Bern, 29/04/2007.