The most buoyant animals are animals that have large quantities of materials that are less dense that water (i.e. lubber, lung tissue, etc.). For example, a whale with a large amount of blubber with be more buoyant that a penguin with less blubber.
However, buoyancy is actually not always the most useful trait for animals who are living in the water. A high buoyancy will make diving and deep swimming (which may be required for hunting) much harder, this in turn causes greater energy use that is not very efficient.
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