In southern South Australia, goanna numbers are declining. A loss of suitable habitat makes it difficult for goanna populations to persist, and much of their remaining habitat is degraded or fragmented. We need to know more about goanna populations, particularly information about where they are and how many there are. But it is difficult for scientists to find them as there are so few of them remaining. For example, it is estimated that there are now fewer than 100 Rosenberg’s Goannas (also known as Heath Goannas) in each of the seven mainland Natural Resources Management regions of South Australia.