Sea snakes belong to the group of animals called Reptiles. They have specialized flattened, paddle-like tails for swimming and have valves over their nostrils which close underwater. As they breathe air using a large lung not gills, they are usually found in shallow water where they swim about the bottom.
The lung, which can extends almost the entire length of the body, can also help with buoyancy to store air for dives. Most sea snakes can also take in oxygen through their skin. A special gland under their tongue concentrates and excretes excess salt water from their body.
Their body is shaped like the keel of a boat. Many species have regular bands or rings of colour around the body. These are for camouflage, and perhaps to show that they are very poisonous or nasty tasting.
They feed on fish, specially eels. Some even feed on fish eggs, molluscs and crustaceans (e.g. prawns). They have fine, sharp teeth to grip their prey before swallowing their prey whole, by sliding each
jaw sideways while their skin stretches.Predators of sea snakes include sea eagles, sharks, large predatory fish, eels, and perhaps even crocodiles from below.