This 15-cent definitive from Australia features the Eastern Snake-Necked Tortoise (Chelodina longicollis), a unique freshwater species known for its remarkably elongated neck. Issued in the mid-1970s wildlife series, the design showcases the tortoise in its natural habitat with fine detailing on its carapace and environment. For collectors, this issue is notable for its biological accuracy and its place in Australia’s broader fauna-themed definitive programme. A clean, attractive piece for zoological and thematic wildlife collections.