endemic species, including the tree Eucalyptus caesia endemic to Boyagin Rock and the lichens Paraparmelia sammyi and Paraparmelia sargentii endemic to Yilliminning Rock. Granite pools are home to 350 species of aquatic invertebrates, including 50 thought to be endemic to the Wheatbelt. Native mammals include the red-tailed phascogale (Phascogale calura), black-flanked rock-wallaby (Petrogale lateralis lateralis), western brush wallaby (Macropus irma), and common brushtail possum (Trichosurus vulpecula). Several other once-native mammals are now locally extinct. Native birds include malleefowl (Leipoa ocellata), Carnaby's black cockatoo (Calyptorhynchus latirostris), Baudin's black cockatoo (Calyptorhynchus baudinii), and Australian bustard (Ardeotis australis). Toolibin Lake is an important breeding area for waterbirds in the inland drainage systems of south-western Australia, particularly freckled duck (Stictonetta naevosa). Land use Much of the land is used for dryland farming, particularly wheat. Extensive areas have been converted to pasture for livestock grazing. Protected areas Less than 5% of the Avon Wheatbelt bioregion is in protected areas. References Further reading Thackway, R and I D Cresswell (1995) An interim biogeographic regionalisation for Australia : a framework for setting priorities in the National Reserves System Cooperative Program Version 4.0 Canberra : Australian Nature Conservation Agency, Reserve Systems Unit, 1995. Biogeography of Western Australia IBRA regions Southwest Australia Mediterranean forests, woodlands, and scrub in Australia