Deutsch: Schwan, welcher einen Eindringling fortjagt
Date 1877
Source Der Ausdruck der Gemüthsbewegungen bei dem Menschen und den Thieren, 1877
Author Charles Darwin
Source: https://commons.wikimedia.org/wiki/File:DarwinAusdruck13.png

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.