Graylag goose / Graugans (Anser anser)

Graugans paar. 2021-03-07 12.23.32
Classification: Genus Geese (Anser); Tribe Anserini; Subfamily Anserinae; Family Waterfowl (Anatidae)
Found on practically all Swiss lakes, especially north of the alps.
Appearance and identification: Grösste europäische Wildgans. [Link]
Vocalization: Various cackling and honking sounds "gaiiiaia-ga-ga". [Link]
Calls: Typically the first syllable is accented, and given with a register break into higher pitch (at 0:18 in recording). [Link]
Physical details: length=75-90 cm, wingspan=147-180 cm, weight=2100-4300 g
Habitats: River and lake

First documented observation : 2021-02-26 in Fehraltorf.