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The article presents information on the common goose barnacle Lepas australis, a pelagic crustacean with an austral circumpolar distribution. These sessile organisms attach to the body surface of marine vertebrates and floating debris, and disperse rapidly over large distances. In July 2010, 600 Magellanic penguins were found dead along the beaches of Sao Paulo state, Brazil. Two of the birds had common goose barnacles Lepas australis attached to their feet.