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Australia has a rich variety of endemic legume species that thrive in nutrient-poor soils because of their symbiosis with Rhizobia bacteria and mycorrhizal fungi. Well-known Australian fauna include monotremes (the platypus and echidna); a host of marsupials, including the kangaroo, koala, wombat; and birds such as the emu and kookaburra.
Heatwaves, or consecutive days of extreme temperatures, are also prominent in Australia. They are the deadliest natural disasters in Australia, accounting for more deaths than bushfires, cyclones, earthquakes, floods and severe storms combined. [25] Extreme temperatures are defined as days where the peak temperature is greater than 35 degrees.
The deserts in the interior and south lack any significant summer rains. The desert in western Australia is well explained by the little evaporation of the cold sea current of the West Australian Current, of polar origin, which prevents significant rainfall in the interior of the continent. [3] About 40% of Australia is covered by dunes. [5]
There are 69 species of cycad from 4 genera and 3 families of eastern and northern Australia, with a few in south-western Western Australia and central Australia [clarification needed]. Native conifers are distributed across 3 taxonomic families ( Cupressaceae , Podocarpaceae , Araucariaceae ), 14 genera and 43 species, of which 39 are endemic.
Australia separated from Gondwana 99 Ma, and initially remained warm and humid with rainforest vegetation. Inland Australia had systems of rivers and lakes with abundant wildlife. Fossil birds, platypus, frogs and snakes are present from this period. From 30 Ma there was a period of global cooling, and from 15 Ma the Antarctic ice sheet formed.
Natural features (consisting of physical and biological formations), geological and physiographical formations (including habitats of threatened species of animals and plants), and natural sites which are important from the point of view of science, conservation, or natural beauty, are defined as natural heritage. [2] Australia accepted the ...