What makes Penguins unique? Let's see... Penguins are not fish, but they can swim. Penguins are birds, but they can't fly. They do have wings, but these serve as flippers - which they use for swimming. Because of their nature, they spend half of their lives under the water and half on land. Even if Penguins are really birds, they are more adjusted to life in the ocean. Even their wings are used for swimming instead of flying. Excited to learn more about Penguins? Get a copy of this book and discover more fascinating information about this animal.