Saltwater crocodiles are exclusively tropical reptiles and usually found in Far North Queensland (several hundred kilometres north-west of Fraser Island), however, occasionally during the warmer season (December through March, when water temperatures reach consistent tropical temperatures) crocodiles may appear in areas in and around Fraser Island. During the 2008–2009 summer several crocodiles (one over 4 metres in length) were present in the surrounding ocean. It is thought that these reptiles are seasonal visitors, as they always disappear during the cold months (presumably returning to tropical northern Queensland. ) This sort of activity was apparently reported but unverified decades ago (a handful of crocodiles have also historically been observed on very rare occurrences around Brisbane, the Gold Coast and Sunshine Coast during the warmer season) but within recent years has been proven and observed more often. Crocodiles do not breed nor do they appear to have any permanent populations living on Fraser Island.