However, boas have tiny spurs that are remnants of hind limbs, and a few other reptiles, such as worm and glass lizards, also lack limbs. Snakes move by pushing against objects with specialized scales on their bellies called scutes. The scutes act like tire treads, gripping the ground and giving the snake the traction necessary to push itself forward. Also, scutes are hard and protect the snake as it moves along rough surfaces. The scales covering the body prevent excessive dehydration by retaining body moisture and contain pigments that form the color patterns of snakes.
Snakes have no moveable eyelids, and therefore can never blink or close their eyes.
A single transparent scale covers the eye. They do not have external ears, but can hear by sensing vibrations through the bones in their head. In addition to being able to smell odors as we do, snakes can taste the air and ground using their forked tongue. Particles picked up by the tongue are processed by the Jacobson s Organ in the roof of the mouth. Most snakes mate in the spring after they emerge from hibernation.