How do gecko lizards walk on ceilings?

Gecko Lizard

Gecko has the ability to walk on walls and ceilings due to special adhesive pads on their feet.  These small lizards live in warm climates.  They have wide-spreading toes.  Each toe ends in a pad and hidden claw.  

These toe pads, made up of thousands of tiny suction cups, enable the gecko to cling to any smooth surface—even glass.  The claws can be moved out like those of a can, and are used on rough surfaces.  

The gecko’s grip is so good that it can scamper easily over walls, ceilings, and windowpanes while watching for insects and other prey.–Dick Rogers