I remember some guy saying in chat that they don't pay the same amount of attention to hydration as many of us here do.
And in all reality, he's partially right. A larger ant colony will create moisture in a nest through respiration, sealing entrance holes and other vacant nest areas, and will also use tools, such bringing in debris or substrate and vomiting water on it, in order to generate some humid sections in the nest.
Edited by drtrmiller, June 4 2015 - 7:31 AM.