A pair of trumpeter swans was very tolerant of me, and came even closer to feed on some greens. They didn't quite come closer than my minimal focus distance, but close enough to make framing and dof a challenge. They were less tolerant of a family coming down the path (perhaps it was the loud colors on the shoes), and soon left.
T2i 400mm 5.6 at f8 1/1000 ISO 400.