I also use Pour-on Ivermectin. I have a few birds who have picked up scaly leg mites on occasion. They are next to impossible to eradicate. I have sprayed down roosts, coop walls, nesting boxes, changed nesting box bedding, etc. Not all my birds have them. Just a couple... At least I assume they have them because their feet are not smooth or look terrible. None of them seem to be itchy or in any pain though. I've treated them sooooo many times with poultry spray for mites, Ivermectin, Vaseline, and mineral oil.