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mulga ants (Polyrhachis
macropus) are invariably associated with the grey-green shrubs of mulga (Acacia aneura), and their odd, circular nests are a common sight on the hard-packed red earth of central Australia; the mulga ant surrounds its nest with a distinctive circular 'fence' of mulga phyllodes, and because the red earth of the centre does not readily absorb water, it is suspected the mulga ants build miniature levees simply to prevent their nests flooding during arid Australia's infrequent heavy rains |
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