Islands hold many unique species and ecosystems, but are greatly impacted by invasive species that can cause native species to go extinct or be threatened. Significant gaps in our knowledge mean that we don’t have a comprehensive understanding of threatened species on Australia’s islands, their threats and how to manage them effectively. We have created a national database of threatened species across all of Australia’s islands, which is helping fill these knowledge gaps, as well as beginning the process of understanding how to best conserve our island-based plants, animals and ecosystems.