Sumalee and Kasem are two baby otters that live at Longleat, a wildlife park and zoo in Britain. In this video, Beverley Allen introduces them a large wading pool. Allen says:
I started off putting them in the sink with a little bit of water when they were about nine weeks old. Then they progressed to my bath, where I could make the water a bit deeper to let them practice their breathing. Now they're splashing around quite happily in a paddling pool, with a few toys to encourage them to play.
Link via Hell in a Handbasket