ORDER SQUAMATA (SNAKES AND LIZARDS)
SUBORDER SAURIA (LIZARDS)
FAMILY AGAMIDAE (DRAGON LIZARDS).
This family is found throughout the old world. Over 50 species occur in Australia, with most occurring in drier areas. Dragons are characterized by their juxtaposed scalation, often including distinctive spines.
They range in adult size from 10cm to a metre. Many species posses pre-anal and femoral pores, which are tiny holes located above the anus and on the ventral surface of the hind legs. The function of these pores is believed to be sexual. All are of the typical 'lizard' form, generally diurnal and egg layers.
Species do not routinely 'throw' or loose their tails, although some, (Notably Water dragons Physignathus sp.) can regenerate a lost tail.

The above was from the book Australian Reptiles and Frogs by Raymond Hoser and now available on a fantastic CD-Rom along with a vast amount of other information, papers and the like on reptiles, frogs and other wildlife.