Do a thread or google search for chicken mites: red roost mites, and northern fowl mites. Also do a search for types of chicken lice. After you've done the reading, you'll then know what you are looking for!
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@PirateGirl has great suggestions. I might also add that what I did/do is I have a battery-operated little night light that I put in the coop for a few days. As it gets dark out, then are drawn toward the light. It's worked great for me.