Stamps with the theme Penguins
The penguin is an amphibian bird living mainly in Antarctica. They have countershaded dark and white plumage and their wings have evolved to become flippers. Most penguins eat fish. They spend roughly half of their lives on land and half in oceanic waters. In the water penguins are astonishingly agile. Penguins' swimming looks very similar to a bird's flight in the air. On land, penguins use their tails and wings to maintain balance for their upright stance.