http://parasitipedia.net/index.php?option=com_content&view=article&id=2402&Itemid=2667
Main species of lice on domestic birds
Cuclotogaster heterographa, the head louse, is about 2.5 mm long and is found mainly on the head and the neck of birds. It prefers to stay close to the skin or at the...
Ear mites, are you sure? I don't think chickens get them, tough they can get lice that go in and out of the ear. Permethrin dust will treat lice and mites on the bird, as will Permethrin spray. Get yourself some of each, treat the birds with the dust, clean the coop, perches, nesting boxes etc...