On Tue, 1 Sep 2009, Jura wrote:
Crocodylians, hippos (probably. Can't say for sure), manatees.I can't say for certain if any of these animals are specifically taking advantage of the buoyancy of water, or if they just "do it" there because it is where they spend most of their time.
Manatees are fully aquatic. Never read of them coming on land.