short-legged flightless birds of cold southern especially Antarctic regions having webbed feet and wings modified as flippers
source: WordNet 3.0
Any bird of the order Impennes, or Ptilopteri. They are covered with short, thick feathers, almost scalelike on the wings, which are without true quills. They are unable to fly, but use their wings to aid in diving, in which they are very expert. See King penguin, under Jackass.
