The swan's so pretty, isn't it? Hard to believe that these little bastards really are the thugs of the Charles River. It's common for people in kayaks and canoes to warn each other if there's a swan ahead, especially since they're known for getting into fits of pissy-ness for no reason. Photo taken while kayaking the Charles River on Sunday, July 27, 2008. (Photo by Lizbeth Marcs)