There is a nest nearby - but this little git has been attacking crews for years - if you find yourself confronted by it - aim for it head on - Swans attack from behind, so usually by the time it's turned around, you'll have escaped. If you hear a loud flapping, get paddling!
Generally it'll just bite the back of your boat, so paddlers don't normally get hurt - but it has had a few folk out of their boats in the past...
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for some more pics of the evil little git http://www.paddlepics.com/watersides/Wat%20D%202006/swan%20attack/index.htm