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...

Chris & Monique Fallows / Southern right whale (Eubalaena australis) close up feeding on plankton at surface, False Bay, Cape Town, South Africa; with barnacles on head

Juergen Freund / Jewelmer Pearlfarm workers clean each pearl oyster regularly taking off barnacles and anything that grows on the shell, Philippines, April 2010

Floris van Breugel / Lines adorn the fractured sandstone rocks along the Barnacle (Cirripedia) and Sea snail inhabitated shores of Palos Verdes peninsula, California, USA

Wild Wonders of Europe / Lundgren / Gooseneck barnacles (Lepas anatifera) on a drifting rope, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Lundgren / Gooseneck barnacles on a drifting rope and a small shoal of Boarfish (Capros aper) seeking shelter, Pico, Azores, Portugal, June 2009 Wild Wonders kids book.

Wild Wonders of Europe / Lundgren / Gooseneck barnacles on a drifting rope and a small shoal of Boarfish (Capros aper) seeking shelter, Pico, Azores, Portugal, June 2009

Wild Wonders of Europe / Quinta / Limpets and Barnacles on rock, Alentejo, Natural Park of South West Alentejano and Costa Vicentina, Portugal, June 2009

Konrad Wothe / Giant Green Sea Anemone (Anthopleura xanthogrammica) group, Goose Barnacles (Lepas anserifera) group and Ochre Sea Stars (Pisaster ochraceus) at low tide, Olympic National Park, Washington

Solvin Zankl / Split level shot with Scottish coastline above and underwater Barnacle (Balanus balanoides) encrusted rock, UK

Solvin Zankl / European / Common lobster (Homarus gammarus) with large barnacle encrusted claws, underwater, Mull, Scotland

Doug Perrine / Southern right whale {Balaena glacialis australis} at surface, barnacles on skin, Atlantic.