They can crush a galvanized steel bucket in ten seconds, with only a few flaps of their wings. And, it goes without saying, do NOT approach a swan family. They fiercely protect their young, called cygnets. I spent over 4000 hours with the daddy swan, Sylvester, on our beach and gradually won his trust. These pictures feature Sylvester and his lifetime mate, Juliette.
Swans can hold their breath easily for thirty seconds.
After surfacing, Sylvester always makes sure I am still there, keeping an eye out for intruders, because he is so close to shore. This is also animated.