I plan on treating them with premethrin. Wanting to learn what kind to see if they may have been responsible for a recent loss i had. These were bright red. I saw them in the coop under hay etc. They weren't out and about. They were bright red and grey. So far i haven't seen them on my chickens. Just all over the coop in the crevices and nesting boxes.
They crawl out to the chickens at night but some will stay in the vent and feed there.
Do you see blood on the eggs?