English: « Cygnus olor » = Cygnus olor (Mute swan)
Français: « Cygnus olor » = Cygnus olor (Cygne tuberculé)
Date 1873
Source Onze vogels in huis en tuin http://archive.org/stream/onzevogelsinhuis02keul#page/n391/mode/2up
Author John Gerrard Keulemans (1842–1912)
Source: https://commons.wikimedia.org/wiki/File:Cygnus_olor_1873.jpg

The mute swan (Cygnus olor) is a species of swan and a member of the waterfowl family Anatidae. Cygnus olor is native to much of Eurasia, and (as a rare winter visitor) the far north of Africa. Cygnus olor is an introduced species in North America, Australasia and southern Africa. The name 'mute' derives from it being less vocal than other swan species.