Sugarmouse Island is an islet with an area of 0.54 ha in south-eastern Australia. It is part of the Mutton Bird Island Group, lying close to the southern end of the south-western coast of Tasmania.[1] The island is part of the Port Davey Islands Important Bird Area, so identified by BirdLife International because of its importance for breeding seabirds. [2]
Recorded breeding seabird species are the Fairy Prion (2000 pairs) and Black-faced Cormorant.[1]