In a modern world, an animal is just an animal to most of us. Though research says that snakes have their set of legs before, say around  100 million years ago. According to Wiki, by definition, SNAKES are elongated, LEGLESS, carnivorous reptiles of the suborder Serpentes that can be distinguished from legless lizards by their lack of eyelids and external ears. Snakes are ectothermic, like all squamates,  amniote vertebrates covered in overlapping scales. Many species of snakes have skulls with several more joints than their lizard ancestors, enabling them to swallow prey much larger than their heads with their highly mobile jaws. To accommodate their narrow bodies, snakes' paired organs (such as kidneys) appear one in front of the other instead of side by side, and most have only one functional lung. Some species retain a pelvic girdle with a pair of vestigial claws on either side of the cloaca. Except Antarctica, living snakes are found on every continent, and on mo