African Lizard

Lizards are reptilian, often four-legged,with an integumentary system comprising scales, with a skull composed of quadrate bones. Lizards also possess external ears and movable eyelids. Encompassing forty families, there is tremendous variety in color, appearance and size. Due to their smooth, shiny appearance, lizards can appear slimy or slippery; their skin is actually very dry due to a lack of pores to excrete water and oils.

Lizards have scales on their skin which may be tubercular or have ossified encrustations called osteoderms.
Most lizards are oviparous, though a few species are viviparous. Many are also capable of regeneration of lost limbs or tails.

Some lizard species, including the glass lizard and legless lizards, have some vestigial structures though no functional legs. They are distinguished from true snakes by the presence of eyelids and ears and a tail that can sometimes break off as a physical defense mechanism. Many lizards are good climbers or fast sprinters. Some can run bipedally, such as the collared lizard and the world's fastest lizard, the spiny-tailed iguana in the genus Ctenosaura.

Many lizards can change color in response to their environments or in times of stress. The most familiar example is the chameleon, but more subtle color changes occur in other lizard species as well (most notably the anole, also known as the "American chameleon," "house chameleon" or "chamele").

source: http://en.wikipedia.org/wiki/Lizard