Ferruginous duck / Moorente (Aythya nyroca)

Moorente. 2021-03-07 12.08.04
Classification: Genus Aythya; Tribe Diving ducks (Aythyini); Subfamily Dabbling ducks plus extinct (Anatinae); Family Waterfowl (Anatidae)
Woody brown (ferruginous means rust-red), black and white with a gray bill. Butt is white, but also a part of the belly not seen when it's in water. Tall head reminds me of a Kolbenente/Red-crested pochard, but is pure brown.
Etymology: The scientific name is derived from Greek aithuia an unidentified seabird mentioned by authors including Hesychius and Aristotle, and nyrok, the Russian name for a duck. [Link]
Calls: Female call similar to female Tufted Duck's "kerr kerr", but thinner and with a strong, peculiar bi-tone. Male display call mostly consists of various short "chk" sounds. [Link]
Physical details: length=38-42 cm, wingspan=63-67 cm, weight=450-700 g
Habitats: River and lake

First documented observation : 2021-03-07 in Rapperswil.