You do not want to mess with a swan that has a nest or babies nearby. I have seen many unsuspecting spectators get too close to a swan and pay a hefty price. This swan slowly circled our boat and it was his friendly way of letting us know that we had gotten close enough to his family. We always try to keep a respectful distance from wildlife so as not to disrupt their lives. F5.6 at 1/5000, ISO 800, 70-200mm lens at 135mm