The characterisation of Australian marsupials’ faecal microbiome is largely uncharted, but has previously been identified as an important component of conservation programs. This project examined the interaction between diet and faecal microbiome of yellow-footed rock-wallabies in South Australia, found that there are similarities with other Australia marsupials and that diet likely affects faecal microbial composition. Continuing to characterise the faecal microbiome of Australian marsupials will provide a valuable tool for their conservation as climate change worsens. Photograph by Stacey Dix.