The New International Encyclopædia/Steamer Duck

STEAMER DUCK, Loggerhead, or Racehorse. A very large duck (Tachyeres cinerus), numerous about the southern extremity of South America, so called on account of its peculiarity of rowing itself along the surface of the water at great speed. This is said to be due to the remarkable fact that this bird loses its power of flight when it reaches maturity.