Changes

==Introduction==

==Introduction==

Lizards occur on all continents, except Antarctica, and on most tropical and subtropical oceanic islands. This widespread occurrence denotes their broad ecological, physiological, and behavioural adaptations to extremely hot or cold climates, extremely arid to freshwater and marine habitats, and lowland to high-elevation regions. Their highest species diversity appears to be in semiarid habitats; for example, 53 species of lizards occur at one site in the Great Victoria Desert, Australia, and in some areas, particularly islands, densities can be greater than 3000 per hectare.

Lizards can be found on all continents, except Antarctica, and on most tropical and subtropical oceanic islands. This widespread distribution suggests broad ecological, physiological, and behavioural adaptations to extreme climates, habitats and regions. Their highest species diversity appears to be in semiarid habitats.

==Taxonomy==

==Taxonomy==