The colonies are easily identifiably here because they deposit the excavated dirt in a crescent-shaped mound a few inches from the colony entrance. There are a very large number of these colonies here. You could easily find 50 colonies per acre.
These colonies are very challenging to cast. They have very narrow (1/8 to 1/4” in diameter) tunnels leading to the large bulbs. During past attempts, the aluminum or zinc hardened in the tunnels before the chambers were filled. This time I used an aluminum alloy which maintains its temperature longer and has lower viscosity. That did the trick.
More pictures of this cast at: https://anthillart.com/castings/107/
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