Yesterday i was swimming on a place in Vienna called "old Danube" (Alte Donau). It was formerly a part of the Danube but after some regulatings of the danube in the 1890s and later in the 1970/80s that sidearm of the danube went death.

Anyway now its a nice place for swimming and a lots of ducks live there like this one i catched at cleaning her feathers :3
The Duck was only one meter away from me, they are very trusting there, cause no one harm them. You can even stroke them and put them on your lap if you feed them enough ;)