Swans have featured recently on a couple of DP sites. Lynn at Cheltenham started it and then Ame from Santa Clara and Mark from Taunton joined in.
We found this black swan swimming in the pond on our visit in November to Oswaldtwistle Mill.
Actually there were two swans.
I'm not sure if black swans are quite as viscious as their white cousins, such as the ones I encountered at Thorpe Acre in Leicestershire.
And here is a link to one I photographed in Southport