You may not think that Penguins are birds because they cannot fly. However, penguins are birds. Penguins lost the ability to fly over a million years ago! Overtime they started hunting for food in the cold waters. There wings became powerful, fast flippers to swim. Penguins have smooth bodies that help them glide easily through the water. They are fantastic swimmers and divers.The emperor penguin can dive the deepest. He can dive up to 1,500 feet(450 meters)!!!!!!!! Large Penguins can swim faster than 25 miles per hour!