If you take a look at the flappers of this Whooper Swan you can see something quite strange about them.
How it should be you can see here http://500px.com/photo/63938625 and here http://500px.com/photo/63844177
Especially on the left foot, for the viewer on the right hand side, there hardly is a web in between the toes.
Don't know what caused this, but it could have been a disease or this swan might have been frozen to the ice some time ago.
Nevertheless he doesn't seem to unhappy looking at his face :-)
Shot taken at Kussharo Lake one of the largest volcanic lakes at the Eastern part of Hokkaido, Japan
Best wishes and have a nice weekend,