National Geographic : 1946 Sep
© National Geographic Society Kodachrome byArthur A.Allen "What's That Noise?" A Startled Hell Diver on Its Houseboat Anchored among the Reeds inaPond near Churchill Horned Grebes get their nickname from marvelous proficiency in swimming and diving, but their legs are set sofar back that they arealmost helpless onland. Their floating nest makes them independent of changes in water level. In fall, when they move south to the Gulf ofMexico, they lose their bright colors.