The perentie is Australia's largest lizard reaching over 2.5 metres in length. It has a long neck and a stout, robust body ending in a long, tapering tail. The colour is yellow or cream with tawny brown rosettes edged in dark brown on their back and they have dark limbs with white spots. The head and neck are pale creamy-white overlaid with a reticulated pattern of black lines and flecks.