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To my understanding, the uropygial usually has a 'wick' feather that sort of looks like a strange, frayed down feather if you look closely (I have examined ones from larger galliformes such as turkeys). The bird sort of gently gives a squeeze to the gland if necessary, or if the 'wick'...
I do hope someone can correct me if I am wrong-- I have studied a lot of avian biology, but I am not an expert nor a veterinarian trained in avian medicine.
I understand that fipronil distributes in the oil glands of mammals. Mammals (at least the one that Frontline is intended for) have oil...