It's complete nonsense that swans can break your arm or leg with their wing. Their bones aren't nearly as strong as a human being's.

What actually happens is that they rear up and give the victim such a surprise that he falls over and breaks something.

Swans are known to drown unwary swimmers by attacking them and causing them to drown from exhaustion. The solution is to grab the swan by the neck and hold its head under the water.

A dead swan makes a useful buoyancy aid.