yes they can eat moths. The brown ones are safe, the ones that hang around the lights at night outside. The only risk we take feeding these types of insects is if they have somehow been exposed to pesiticde spray. What I usually do is catch the moths and keep them for a day or so in a container. If they die, then oh well. If they are alive, I figure if they were exposed to pesiticde they would be dead so I feel they are safe to feed..