These snakes often prey on fish and other unsuspecting marine animals. These snakes often dive to great depths, staying underwater for long periods of time. A number of these snakes are completely blind with no eyes and almost no ability to stretch their jaws wide to acommodate large prey. Therefore many are obliged to feed on small creatures. One species in this group holds the record for smallest snake, a thread snake at 4 inches long.
Fossorial snakes are probably the most primitive and positively weird snakes.
The Deserts S nakes seem to be ideally suited to arid areas, as they take most of their fluids from prey and therefore need very little water. The amount of food they need is also minimal. Most snakes stay in shelters such as burrows during the day, emerging at dusk and retreating when it gets too cold or when morning arrives. Their slender shape allows them to escape the potentially lethal highs and lows in the desert by crawling into crevices and burrows into which other desert-dwellers cannot. Their scales limit water loss, a very important factor in this scorching, water-deprived land.