An incredible metal structure is made by pouring molten aluminum into a fire ant colony. The resulting cast is huge, weighing 17.9 lbs. and reaching a depth of 18 inches.
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These are the red imported fire ants (RIFA) which are harmful to the environment and their nests are exterminated by the millions in the United States using poisons, gasoline and fire, boiling water, and very rarely molten aluminum.
From Wikipedia: "Researchers have also been experimenting with extreme temperature change to exterminate RIFAs [red imported fire ants], such as injecting liquid nitrogen or pressurized steam into RIFA nests. Besides using hot steam, pouring boiling water into ant mounds has been found effective in exterminating their nests."
I did a casual survey and found that I have at least 120 of these colonies within an area of approximately three acres. http://www.anthillart.com/info/fire-ant-survey/
See detailed pictures of the resulting cast on the Anthill Art website at http://www.anthillart.com/castings/043/