What do sea snakes drink?

Sea snakes spend pretty much their entire lives at sea. It was once thought they could drink saltwater, excreting the excess salt via a gland near their eye (as sea turtles do) but recent research has shown that they also need fresh water. The yellow-bellied sea snake, for instance, which rarely comes ashore, is reliant on rain. It drinks from the very surface layers of the sea following a storm, where, for a short time at least, the salinity is low enough to allow the reptile to quench its thirst.