Chalky, Big Green and Badger Island Groups

Country/territory: Australia

IBA Criteria met: A1, A4i, A4ii (2009)
For more information about IBA criteria please click here

Area: 2,100 ha

Protection status:

BirdLife Australia
Most recent IBA monitoring assessment
Year of assessment Threat score (pressure) Condition score (state) Action score (response)
2008 medium not assessed not assessed
For more information about IBA monitoring please click here

Site description
This IBA extends from the Pasco Islands off north-west Flinders Island south through the Chalky, Big Green and East Kangaroo group to the Badger group off south-west Flinders Island, in the Bass Strait. It includes North, Middle and South Pasco Islands (28, 8 and 21 ha; Crown Land; Pacific Gull), Marriot Reef (3.4ha; Crown Land; Pacific Gull), Wybalenna Island (16 ha; Conservation Area; Pacific Gull), Low Islets (0.8 ha; Crown Land; Pacific Gull) but not Prime Seal Island (which could support large numbers of nesting shearwater if grazing pressure was reduced), Chalky Island (41 ha; Conservation Area; geese and seabirds), Little Chalky Island (5 ha; crown land; Pacific Gull), Mile Island (4 ha; Conservation Area; Pacific Gull), Isabella Island (11 ha; Nature Reserve; Pacific Gull), Big Green Island (122 ha; Nature Reserve; Cape Barren Geese), East Kangaroo (157 ha; Nature Reserve; Cape Barren Geese); Mount Chappell Island (323 ha; private; large shearwater colony; other birds not counted), North West Mount Chappell Islet (0.7 ha; 35 pairs Pacific Gull), Little Goose Island (3.6 ha; Nature Reserve; many Pacific Gull), Badger Island (1243 ha; private; Cape Barren Geese), Little Badger Island (2.5 ha; Nature reserve; Black-faced Cormorant colony), Goose Island (109 ha; Conservation Area; many seabirds) and Beagle Island (1 ha; Nature Reserve; Pacific Gull and cormorant). The Pasco Islands are small rocky granitic islands with some sheep grazing. Marriot Reef is a small islet group of low granitic islands. Chalky Island is a granite island with dolerite dykes and limestone outcrops. Vegetation varies across the island with Rhagodia candolleana and Tetragonia implexicoma dominating the south of the island, Poa poiformis and Rhagodia candolleana dominating the centre and halophytic shrubs growing in the northern area. Little Chalky Island is a small, flat granite island dominated by Poa poiformis, Rhagodia candolleana and Atriplex cinerea. Mile Island is dominated by Atriplex cinerea and Tetragonia implexicoma in the southern region and bare granite in the north along with Poa poiformis. Isabella Island is a low, flat, circular island dominated by Poa poiformis, Rhagodia candolleana and Acaena sp. Big Green is grazed and has two farmhouses and an airstrip. East Kangaroo is mostly abandoned sheep pasture dominated by introduced pasture and thistles. Mount Chappell Island is farmed, has been burnt and ploughed, and suffers from many introduced species including cats. Goose Island has a lighthouse and has been grazed; it is now dominated by grass, succulent forbs and African boxthorn. Badger Island is a large grazed island which suffers from grazing, burning, introduced species and depredation by Tasmanian Devils. Little Badger Island is a small gently sloping grassy island. Mount Chapell and Badger are Indigenous Protected Areas. The boundaries of this IBA are somewhat arbitrary but all the islands are important for their geese and/or seabirds.

Key biodiversity
Other birds have not been documented for this IBA.

Non-bird biodiversity: Metallic Skink, White-lipped Whip Snake, White's Skink and Tiger Snake.

Recommended citation
BirdLife International (2020) Important Bird Areas factsheet: Chalky, Big Green and Badger Island Groups. Downloaded from on 29/05/2020.