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Mewstone is an oval 13.1 ha island, composed of muscovite granite, with steep cliffs and a small flat summit. It is part of the Pedra Branca Group, lying 12 km southeast of Maatsuyker Island, and 22 km off the south coast of Tasmania in south-eastern Australia. Its highest point is 150 m asl. Although it is sometimes referred to as Mewstone Island or The Mewstone, its official name is simply Mewstone. It is part of the Southwest National Park and the Tasmanian Wilderness World Heritage Site and is known for its inaccessibility, unusual shape and abundant bird life. It has been identified by BirdLife International as an Important Bird Area (IBA) because it supports over 1% of the world populations of Shy Albatrosses and Fairy Prions.
There is very little flora due to the rocky nature of the island. What little plant life there is grows in crevices in the rocks where soil has accumulated.
Recorded breeding seabirds include Fairy Prion (20,000 pairs), Silver Gull, Black-faced Cormorant and Shy Albatross (7,500 pairs). Mewstone is the largest of only three Shy Albatross breeding colonies in the world, the other two being Albatross Island and Pedra Branca. Australian Fur Seals haul-out on small ledges. The Tasmanian Tree Skink is present.
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