The term 'Australian Reptile' can be summarized by the crossword solution 'Goanna' (6 letters). Goannas are a type of monitor lizard native to Australia and New Guinea. They are large lizards, typically growing up to 2 meters in length, and they feed on insects, small mammals, and other reptiles. Goannas are an iconic species of the Australian outback, and are often featured in Aboriginal art.