Mary Cairncross is a notable figure in the field of environmental conservation in Australia. She is best known for her work in promoting the importance of preserving natural habitats, particularly in the Sunshine Coast region of Queensland. Her efforts have significantly contributed to the protection of local ecosystems and biodiversity. In addition to her conservation work, Mary Cairncross is recognized for her role in establishing the Mary Cairncross Scenic Reserve. This reserve serves as a vital sanctuary for native flora and fauna, offering educational opportunities for visitors to learn about the unique Australian rainforest environment.