There are many kinds of sea snakes, and there are many kinds of sea snakes in the world, about 50 of them. Sea snakes and cobras are closely related by blood, so they are both poisonous snakes. Common species are long-kissed sea snakes, green-gray sea snakes, ring-striped sea snakes and green-ring sea snakes. There are also many different species of sea snakes in China, most of which are distributed in Hainan, Taiwan, Guangxi and Fujian. In addition to the common ones, there are flat-chin sea snakes, black-headed sea snakes, light gray sea snakes, semi-ring flat-tailed sea snakes, green-gray sea snakes, small-headed sea snakes, sea vipers, blue-gray flat-tailed sea snakes, flat-tailed sea snakes, glans-penis sea snakes, spine-canthus sea snakes, spine-scale sea snakes and so on.

Sea snakes like to inhabit shallow water around islands, some sea snakes like to stay in muddy water at the bottom of sand or mud, and some like to live in coral reefs and other environments. Different species of sea snakes dive at different depths. They can't stay in the water for too long. Generally, they swim to the water once in about half an hour. There are also some deep-water sea snakes, which can dive for about 2-3 hours. Sea snakes are distributed in tropical areas, so they like to grow in warm environment. Sea snakes have certain toxicity. If they are bitten by sea snakes, muscle weakness and soreness may occur.