Snake

Any of more than 3,400 species of reptiles characterized by their limbless state and enormously elongated body and tail are classified as snakes (suborder Serpents). Snakes are lizards in the order Squamata, and they represent a lizard that has undergone structural reduction, simplicity, and loss, as well as specialization, during the course of evolution. Although all snakes are devoid of external limbs, not all legless reptiles are snakes. Some burrowing lizards may only have front or back limbs, or they may be completely legless.Snakes, unlike lizards, do not have movable eyelids, which results in an unsettling look. Snakes don't have external ear holes, either. They've lost their urine bladder on the inside. The visceral organs are extended, with the left member shrinking in comparison to the right; the left lung is substantially decreased, if not completely eliminated. Snakes, on the other hand, have more vertebrae than other vertebrates and have created two novelties: a tracheal lung in the neck area and a venom-conducting system for subduing prey.