Islands are biodiversity hotspots, punching above their weight in the global ecosystem. Despite covering just 5.5% of the Earth’s landmass, they are teeming with life, hosting 15% of all terrestrial species and a staggering 37% of all Critically Endangered species. Around two-thirds of recent species extinctions have occurred on islands. Marion Island is a globally significant breeding site for several seabird species, some of which are listed as Endangered. However, this rich biodiversity is under significant threat. It has been projected that 19 of the 28 seabird species that breed on Marion Island will become locally extinct if the mice are not eradicated.
Invasive mammals, including non-native mice like those found on Marion Island, are the primary agents of animal extinctions on islands worldwide. To counter this, eradication projects, such as the one planned for Marion Island, have proven to be the most effective conservation strategy.