We have a cottage in the Berkshires on a lake. If I let the ducks out to swim, will they stick around? Can I coax them in with treats? Can they outswim a dog? These are runners. What about boats - are they fast in the water? I mean, no one's going to aim for them or anything (I hope), but can they swim fast? I really want them to be with us - should hatch in about two weeks.