Penguins are aquatic, flightless birds that are highly adapted to life in the water – while other birds have wings for flying, penguins have adapted flippers to help them swim. Penguin eyes are sensitive to the colours of the sea – violets, blues, and greens. Their eyes also have a second transparent eyelid, serving as goggles while the animal is underwater. There are 17 species, but the Galapagos Penguin is the only penguin that ventures north of the equator in the wild.
See also: Galapagos penguin, Humboldt penguin, Jackass/African penguin, King Penguin