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los patos, como las ballenas, se sustentan tamizando el cieno y el agua, y la familia ha sido llamada algunas veces de los criblatores, o cribadores.
in answer, it may be asked, why should not the early progenitors of the whales with baleen have possessed a mouth constructed something like the lamellated beak of a duck? ducks, like whales, subsist by sifting the mud and water; and the family has sometimes been called criblatores, or sifters.