It's a little hard to see but looks like lice to me. Can you see any clumps of white eggs on the base of the feathers, especially near the vent or head/neck areas? Any other bugs in those areas?
Does it move fast? It is shaped and colored like a louse. There would probably be more under the lower belly if you part the feathers. Lice eggs would normally be found at the base of feathers. They are bes t treated with permethrin dust or spray on the skin every 10 days at least twice.
It was lice. I got to the store and bought pet-safe lice shampoo and powder. Im gonna treat my hens and the coop.
Never had a problem with lice, i wonder where it came from!!