Penguins are flightless, aquatic birds that are native to the Southern Hemisphere. They are classified as birds because they share a number of key characteristics with other birds, including feathers, wings, and a beak.
One of the most distinctive features of penguins is their ability to swim. Penguins have webbed feet and streamlined bodies that allow them to move through the water with great agility. They are also able to dive to great depths, and some species can hold their breath for up to 20 minutes.