 In addition, the toes of chameleons are divided into two opposed groups on each foot (zygodactyly), enabling them to perch on branches as birds do.Aside from legless lizards, most lizards are quadrupedal and move using gaits with alternating movement of the right and left limbs with substantial body bending.This body bending prevents significant respiration during movement, limiting their endurance, in a mechanism called Carrier's constraint.