13829601 - Guano covered rocky island, Sea of Cortez, Baja California, Mexico13829581 - Guano covered rocky island, Sea of Cortez, Baja California, Mexico13777669 - Brown Pelicans (Pelicanus occidentalis) perch on guano-covered rock at Point Lobos State Natural Reserve with Monterey Peninsula in the background; California, United States of America70366703 - PERUVIAN BOOBY sula variegata ON BALLESTAS ISLANDS IN PARACAS NATIONAL PARK PERU GUANO PRODUCER71210907 - Gentoo penguin (Pygoscelis papua) colony and guano covered snow, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions
