Rhynchocephalia

Lizards Skulls. Caiman Lizard Skull, Iguana Skull, Komodo Dragon Skull, Rhino Iguana Skull, Varanus Salvator Skull.

Lizards are reptiles, often four-legged, with scaly skin. Lizards possess external ears and most have movable eyelids. Encompassing forty families, there is tremendous variety in colour, appearance and size. Due to their smooth, shiny appearance, some lizards can appear slimy or slippery although 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 of the genus Ctenosaura.