These are the first penguin fossils to be found. They stood between 43 and 55 inches tall. It had feathers and swimming length measures of 1.5 meters. They had long wings that propelled them underwater, but as penguins' diet became more and more dependent on fish, the penguins developed flippers. Flippers, which are paddlelike, help the penguin appear to "fly" through the water and catch fish quicker.
Also, the dense bones of wings are solid and help the penguins overcome buyoncy.