I noticed that one of my hens was preening like crazy and sure enough she had lice. So I dusted underneath her feathers with diatomaceous earth. However, dusting her didn't seem to fix her constant preening and scratching. I examined her feathers and saw what I thought was lice egg clusters all over the shafts of her feathers. At my wit's end, I brought her to the vet. The vet took one of the supposed egg clustered feathers and looked under a microscope. It turns out that although dusting her with DE fixed the lice issue, it caused an entirely new issue! DE was clinging to the shafts of nearly every feather and irritating her, causing her to scratch and pick at her feathers. The vet suggested giving her a bath with shampoo to try to break up and eliminate the DE on her feathers. My question: has anyone had a similar problem? In all the things I've read, no one has mentioned DE causing this problem for their chickens. Thanks for any help you can give!!