Nope. Just hover and nothing else from what I can tell.
A friend in south carolina told me she had gnats that did the same at her place but she had one hen show a bite by swelling around her eyes. Those same Buffalo gnats tried to destroy my flock and treating everything with that stuff TexasKiki posted is what saved the remainder. The friends husband is with Orkin so they were able to identify what it was. Could you capture and take pics of a few of them? I dont think that theyre buffalo gnats inside the coop though, they like open sunny areas theyd come in the house biting me and run to the window once inside, didnt want to even chase me as a meal once indoors. Treating with it would probly help your problem anyway.