“Water everywhere and not a drop to drink.” Talking about the sea, of course. Each 100 pounds of seawater contains almost 4 pounds of salt. You can’t drink that. What do marine mammals such as dolphins, manatees, orcas, seals and whales drink?
Marine mammals do not actually drink. They get all the water they need from the fish that they eat. The fish they eat do drink the sea water – lots of it – which is processed through diffusion and osmosis.
Marine mammals in captivity that for some reason are not eating are fed freshwater from a pipe or bottle.