Barnacles attached to the chin of a humpback whale (Megaptera novaeangliae), United States of America, Pacific, North America

Common limpets (Patella vulgata) and acorn barnacles (Balanus perforatus) attached to rocks exposed at low tide, Dorset, England, United Kingdom, Europe

Common limpet (Patella vulgata) surrounded by acorn barnacles (Balanus balanoides), Loch Carron, Wester Ross, Scotland

Common limpet (Patella vulgata) surrounded by acorn barnacles (Balanus balanoides), Loch Carron, Wester Ross, Scotland

Hawaii, Acorn barnacles (Coronula diaderma) and goose neck barnacles (Conchorderma auritum) attached to a Humpback whale tail (Megaptera novaeangliae).