The name for about 300 species of reptiles that form the family Gekkonidae in the order Squamata. They are small lizards, primarily arboreal and nocturnal, which occur in the warm regions of the world. The body is flattened and never exceeds 14 in. (35 cm) in length. Most species have five digits, while some have only four; the toes often have adhesive pads to assist the animal when climbing on smooth surfaces.