Some interesting information about snakes:
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. Like all squamates, snakes are ectothermic, 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.
The body of the snake is covered with scaly skin. Contrary to popular belief (because of the possible confusion of snakes with worms) snake skin dry rather than wet and slimy. Most species of snake skin from the abdomen and a special adapted for greater traction, facilitating movement. Eyelids snake represented transparent scales and remain permanently closed. Change skin snake called desquamation or shedding. Snakes skin changes simultaneously, one layer. Despite the apparent heterogeneity, the snake skin is not discrete and peeling of the top layer of skin - the epidermis - during moulting resembles reversing stocking inside out.
Teeth are snakes in the dental, maxillary, wing-and sometimes Premaxillaries. The teeth are sharp and thin, adherent to the edges of the maxilla and connected to the jaws by special bundles. Have poisonous snakes on the maxillary bones are large, sharp, recurved fangs. These teeth have a groove on the front surface or inner channel through which poison the bite enters the wound. At viper snakes by mobility shortened maxillary bone fangs can be rotated by 90 °. Fangs in some cases (Gaboon vipers) reach a length of 4.5 santimetrov.Zmei different lots of vertebrae (200 to 450) .Grudiny as the chest, no, when ingested food ribs apart. The shoulder belt is missing. The rudiments of pelvic girdle saved some families of primitive snakes.