A penguin is not a mammal but a bird they dont give birth to the young ones as mammals do. Penguins are Flightless Birds. Fun Facts About Penguins Animals Baby Animals Penguins What is a Penguin. . Penguin is egg-laying creatures. They exhibit all the characteristics which are necessary for them to be a bird. Rather than milk they feed their young regurgitated fish. Even though penguins cant fly they. Lots of people think penguins are mammals rather than birds because they cant fly and we see them swimming underwater or. Penguins are flightless birds so even though they cant fly Penguins are still classified as birds. No penguins are an aquatic flightless bird. Childrens literature animated films and commercials present incorrect or incomplete information about these. Penguins are birds and although they are flightless they share many other characteristics with the rest of the bird family. ...