So far I've tried live moths, scrambled egg bits, finely-torn spinach leaves, a slice of tomato, and large, peeled apple chunks. The first two items they loved, the rest they checked out then decided "naw". I'd like to give them something to do in their brooder. Are there some grains that would be ok to sprinkle around in there for them to scratch for? Other treats that could serve double-duty in keeping them entertained as well as extra nourishment?