A mute swan at Melton Country Park in Melton Mowbray, Leicestershire, England.
Description adapted from Wikipedia (http://en.wikipedia.org/wiki/Mute_Swan):
The Mute Swan (Cygnus olor) is a species of swan, native to much of Europe and Asia. It is also an introduced species in North America, Australasia and southern Africa. The name 'mute' derives from it being less vocal than other swan species.
The Mute Swan is wholly white in plumage with an orange bill bordered with black, and can be recognised by its pronounced knob atop the bill.
Adults of this large swan range from 125 to 170 centimetres (49 to 67 in) long with a 200 to 240 centimetres (79 to 94 in) wingspan. They may stand over 120 centimetres (47 in) tall on land. Males are larger than females and have a larger knob on their bill.
The Mute Swan is one of the heaviest flying birds, with males (known as cobs) averaging about 12 kilograms (26 lb) and the slightly smaller females (known as pens) weighing about 9 kilograms (20 lb). An unusually big Polish cob weighed almost 23 kilograms (51 lb), surpassing the longer-bodied Trumpeter Swan to make it the heaviest waterfowl ever recorded.
Straightened in CNX2
Color Control Point selectively applied in CNX2 to brighten swan's head