Tony Wu / Humpback whale (Megaptera novaeangliae) adult female at rest. The tubercles on the whale's head are clearly visible, as are the barnacles (Coronula diadema), whale lice (Cyamus boopis), and hairs on t...

David Fleetham / Humpback whale (Megaptera novaeangliae) pectoral fin with Whale barnacles (Coronula diadema) upon it. Whale at surface, Hawaii.

Tony Wu / Humpback whales (Megaptera novaeangliae) diving in synchrony. Both flukes, but particularly the one in the rear, are covered with Coronula diadema barnacles, which are found exclusively on humpback wh...

Tony Wu / View of the underside of an adult female humpback whale (Megaptera novaeangliae) with hemispherical lobe and mammary slits visible. Acorn barnacles (Coronula diadema), which are found only on humpback...

Doc White / Humpback whale (Megaptera novaeangliae) with two kinds of barnacles, the long Gooseneck barnacle (Conchoderma aurtium) which lives on the Acorn barnacle (Coronula diadema) also whale lice, (Cyamus boo...

Tony Wu / Southern Humpback whale (Megaptera novaeangliae australis) dorsal fin detail with Acorn barnacles (Coronula diadema) and whale lice (Cyamus boopis) visible, South Africa

David Fleetham / Humpback whale (Megaptera novaeangliae) tail with acorn barnacles (Coronula diaderma) and goose neck barnacles (Conchorderma auritum) attached, Hawaii.