Two Mute swans, 兩隻疣鼻天鵝

Two Mute swans (Cygnus olor) after copulating on the Neckar river in Mannheim, Germany, Feb. 15, 2017. (Photo: Ronald Wittek/EPA)
Photos of the day - February 15, 2017
https://www.yahoo.com/news/photos-day-february-15-2017-slideshow-wp-192151595.html

Mute swan - Wikipedia

疣鼻天鵝別名瘤鼻天鵝、啞音天鵝、赤嘴天鵝、瘤鵠、亮天鵝、丹鵠（古名）等。