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snakes have no legs. Snakes have no external ear opennings All snakes have a backbone (They are vertebrates) but lack limbs , eyelids and external ear openings . snakes have a specialized row of scales along the underside of their bodies , the ventrals some families of snakes do retain vestigal pelvic gridles none of them have pectoral girdles snakes have unique skulls- the bones of their upper jaws are not united at the snout but are free …

…the tip of each fork into a pair of chambers called the Jacobson's organ, which is connected directly to the brain. The boas, pythons and vipers have an additional sense called heat pits, and are found in the face. Each pit is large and is lined wtih a sensitive membrane that detects heat. They can pinpoint the position of warm-blooded animals even in total darkness. With these they can judge the distance to their prey.