This report provides a comprehensive overview of Australian fauna and its ecological context. It begins with an introduction to ecology and biogeographical regions, highlighting Australia's unique isolation and its impact on the evolution of diverse species. The report details various fauna groups, including birds (such as ratites, megapods, and parrots), mammals (monotremes, marsupials, and placental mammals), reptiles and amphibians (lizards, snakes, frogs, and crocodiles), and invertebrates. It discusses the ecological roles and conservation status of these animals, including those facing extinction, vulnerability, and critical threats. The report references key scientific literature to support its findings, emphasizing the interconnectedness of species and the importance of understanding Australian fauna for conservation efforts. The report also covers the effect of bell miner presence on bird abundance, psyllid abundance, and eucalypt health. The study hypothesized that within the bell miner colony there would be decreased bird abundance, increased psyllid abundance, and decreased tree health. The study found that there was greater non-bell miner bird abundance outside and increased psyllid abundance within the bell miner colony. Contrary to earlier studies, the health of trees within the bell miner colony was found to be higher than outside the colony.