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This bird is suffering from Knemidocoptes mites, which cause disfiguring dermatitis and skin thickening that can result in severe damage. His legs look as if they are made of winged elm bark. The mites are passed on from one bird to another (e.g., a parent to a nestling) through prolonged contact. The scaly leg infection is probably caused by K. jamaicensis. The condition can be treated with drugs in domesticated birds.