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willows

  • As the number of wolves grew in Yellowstone, so did the size of willow trees. (Wikimedia Commons)
    More Wolves, Taller Willows
    Walker Rhea
    The willows in Yellowstone National Park used to commonly grow up to 157 inches tall. But in the 1990s, most willows in the northern part of the park only grew to be 39 inches.