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Australian lungfish
A lungfish is a member of the subclass Dipnoi of the Osteichthyes that contains a large number of fossil forms and three living freshwater groups, found in Africa, South America, and Australia respectively. As their names suggests, the lungfish have lungs, organs not fund in any other living fish. The African and South American lungfish are unusual in their ability to aestivate (see aestivation) in cocoons of mud during droughts.

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