Semi-aquatic areas usually have an abundance of food as the water attracts numerous animals. Snakes seem to have taken good advantage of the swamps and marshes. This habitat seems to have never been fully inhabited by snakes, as there is little cover, making it easy to be spotted by predators. Overall temperatures may be too low in many of these areas and food supply sparse. Aquatic Habitats Only a few specialized species are totally at home in the water.
All sea snakes are fatally venomous and that is how they catch their food.
Most aquatic snakes mainly feed on fish, though some also eat eggs, shrimp and other invertebrates. This is another habitat that is not widely used when it comes to snakes.