I have four chicken pens defined by 10' x 10' dog kennels. Floor is 3" gravel. It appears I have some some of moth that is very abundant living in the gravel. A broody hen with a single chick is largely forgoing the chick starter I provide. She and chick in particular are eating the moths. I have not seen the pupae of larvae but suspect they are also present. Chick's crop is full of the insects almost all day long. Hen digs pretty good wholes in to gravel to get at them.