The dolphins like to wallow in the sand in shallow waters. Their skin is protected by a thin gelatinous layer against any cuts that mussels and rocks can cause in the process, or algae that would normally stick to skin.
ASIAN ELEPHANT underwater (Photo: Oliver Blaise)
These elephants are used as labour on the indian Andaman Islands for transporting timber. As there are around 500 islands they swim from one work station to the other. Elephants move underwater better than humans.