Thanks will give them a close look today. Do you spray the surface spray directly onto their feathers?
Lice lay their eggs near the vent, the northern red fowl mite is miniscule, I check at night with a head lamp and magnifying glass. Some species of mite live out their entire life on the bird , whilst others leave the host just before dawn to hide in the crevices of the coop. Then once the birds come back to roost for the night, they crawl back along the roost and back onto the host to feed for the night.
When I clean the coops I spray the roost from every angle , the walls the floors , everywhere. Best to do this whilst the birds are out in the yard.
Insects build up a resistance to permethrin and pyrethrum products over time, so best to only use when it is necessary .

Yes you can spray the birds direct, under the wings , behind the neck and the area around the vent, but not directly on the vent. Be careful not to spray the bird in the eyes or face.