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BiologyUsually found in large river systems associated with floodplains or non-perennial tributary streams which flow through flat country (Ref. 13337). It has the ability to use gills and lungs to breathe in and out water; when the floods recede it excavates a burrow in shallow water, deep enough to take its body, and by the time the water has disappeared the lungfish is encased in a thin membranous cocoon made from secreted mucus and mud (Ref. 13337). Aestivation lasts until the habitat is again filled with water; preys mainly on slow-moving bottom-dwelling creatures such as snails, insects and worms, but also takes fish and amphibians; a nest, varrying from a simple excavation to a U-shaped tunnel, is constructed for breeding purposes; male guards the nest with eggs and young; may live for many years (Ref. 7248, 52193).