Yellowstone's red fox cleverly hunts for mice that it can only hear, not see, beneath the snow. From the "NATURE" episode "Christmas in Yellowstone." Academy Award-winning actress Linda Hunt narrates the film, which re-airs Dec. 23. Airing each Sunday night on PBS, "NATURE" is produced by Thirteen/WNET New York. Major corporate support provided by Canon U.S.A., Inc. and Ford. For more information, visit http://www.pbs.org/wnet/nature/yellowstone/index.html (Music: "Dance of the Sugarplum Fairy," composer, Pyotr Ilyich Tchaikovsky)