I was looking at a 3 month old pullet I recently bought from someone and I saw a little white bug on her. It was teeny! It was moving around the back of her head. I know it wasn't a mite because I checked her for mites, and it's rare for chickens to get them under a year old anyways. I only saw one bug, and I have no clue what it was. Just in case though, I powdered her and the cockerel I got with her lightly tonight before I put them in their bed.