 The Mutton Bird Island is part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site.The island is part of the Port Davey Islands Important Bird Area, so identified by BirdLife International because of its importance for breeding seabirds.Recorded breeding seabird species are the little penguin (500 pairs), short-tailed shearwater (3-4000 pairs), fairy prion (1500 pairs) and silver gull.