Gentoo penguin coming ashore, after foraging at sea, walking through ocean water as it wades onto a sand beach. Adult gentoo penguins grow to be 30" and 19lb in size. They feed on fish and crustaceans. Gentoo penguins reside in colonies well inland from the ocean, often formed of a circular collection of stones gathered by the penguins. New Island, Falkland Islands, United Kingdom