Snakes are modified forms of reptiles, which belong to the suborder Serpent or Ophidia. The cylindrical, limbless body (though some ancient species like boas and pythons possess vestiges of Pelvic and hind limbs), absence of ear drum and eyelid are some of the features which throw light on their evolution from their lizard like ancestors. Adaptability is the unique feature of snakes and can be seen not only in their physical appearance but is also evident from their internal organs and systems.The varied patterns and colours of the body scales, oar like tail in sea snakes, tube like lungs, all speak for their adaptive property.

The main purpose of this ability is to ensure its sustenance in a variety of habitats such as water deserts and forests. Infact, this is the secret of their wide distribution throughout the world.

They are carnivorous , ectothermic reptiles, possess low metabolic rate and poor insulation or cooling mechanisms. They go into hibernation and aestivation in order to compensate for heat loss or gain in different seasons. The body is elongated, may vary in length and thickness from specie to specie and is covered with a dry, soft and scaly skin. Scales vary in colour and texture in order to provide camouflage, protection from predators, enable locomotion and help in lowering water loss.

All internal organs are arranged to meet the needs of its slender body. The throat is lined with powerful muscles to push the food down to the main digestive system, lung(s) are tube like, heart, liver and kidneys are flattened.

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