Onesy is my little one-legged duck friend in the pond/stream I overlook from my balcony. I'm not sure what happened to her, as she started her life with two legs. She is an inspiration. All the other ducks waddle about and she does this little hop/scoot thing. They band together and help her out.
And does a one-legged duck swim in a circle? Nope! But I can always tell which one is her because she has to curve her tail-end in a strange way to balance out so she doesn't swim in a circle:-)
I keep trying to capture a good picture of her, but she's too quick for me.