von Phasmid » 14. Jan 2009 16:58
Yes, like donbilbo said, you can put solid material into the basin to retain water, I use thick plaster for mine (needs to be very thick when liquid other wise, once dry and you put the ants in, the ants will burrow into it like mud). Also when the colony is bigger they will help with humidity but you will still have to occasionaly add water if the room you keep them in is quite dry.
@tail_ : Although this is true that most leaf cutter ants living in humid environments, remember they are not always from humid environments, Acromyrmex versicolor , for example, lives in a desert.