Went ahead and treated the whole flock with a mineral and tea tree oil mix on their legs. No one else really showed any signs of it but our dominant rooster (Big Red), who was fine one day and had raised scales the next. Yikes! The biggest mystery, though, is where he got them from! No new flock members have been added besides the chicks, and he has never been exposed to them or been in their kennel. He's separate from the girls, being in the adjacent goat pen along with our other rooster. Also notable is that the other rooster doesn't have them. We wondered if it was perhaps the hay? The other rooster sleeps on a roost but Big Red sleeps on the ground, in the hay (easier for him to see the hens through the chicken wire barrier in the barn ). We've always gotten our hay from the same place and they don't own any chickens. Though, it might be worth noting that when big hay trucks have bales fall off into the road and don't come back for them, my dad'll pick them up. Might ask him not to anymore, worried what might be in the hay. I once read that wild birds can carry scaly leg mites? Are they affected by it the same way as chickens? It seems like the answer would be an obvious yes, but internet research has gotten me nowhere. The only scale mite cases I can find are always on domesticated fowl. Anyone know if wild birds carry this parasite? The chickens do like to hang out under their feeders. And if this is the case, anything I should do? Perhaps we'll spread some Diatomaceous earth under the feeders just in case. I don't like the idea of the poor robins and chickadees and jays having to deal with it either!