If we look at the lizard's feet, we can see that their toes are covered with thin skin. As a result, when the lizard moves with its feet, it presses against the wall or the roof , leaving the place of its feet airless. The pressure of the surrounding air on this airless space allows the lizard to get stuck effortlessly. Again, if necessary, the foot can make air gap in the empty space by making some gaps in any direction. The lizard can move its muscles very quickly to evacuate and inhale air, so it can move quickly through flat walls without falling off walls or ceilings while walking.