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I have always been told to watch to see if ant-hole mounds are built up as a sign of imminent rainfall. My questions are,

if what I have always been told is true, then by what mechanism do ants 'sense' the imminent rainfall? Is it a case of sensing air pressure drop, increasing humidity or both?

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Thank you for the edit - I could not think of the word 'entomology' when I posted :) –  user3795 Jun 19 '13 at 21:24
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