Penguins are birds. They have feathers, beaks and wings, and they lay eggs.
Penguins look a bit little like seals when they swoop swiftly through the water.
Both seals and penguins have streamlined bodies adapted for swimming and diving. And both seals and penguins breathe air. But penguins are seabirds, while seals are sea mammals. But when penguins are afraid or angry, they can put their heads down and run with surprising speed. A penguin's legs are set far back on its body.