Penguins can be very big or small -- Some penguins live at the beach -- Penguins use camouflage -- Penguins have special tongues -- Penguins sneeze salt -- Penguins can see colors -- Penguins waterproof their feathers -- Penguins can speed through the air -- Penguin waste can be seen from space -- Penguin parents take turns -- Penguins recognize each other's voices -- Penguins lose their feathers each year -- Fact sheet.