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From the wolves’ perspective, this is clearly good news. But it also had beneficial effects on the ecology of the park, according to a study published in 2004 by William Ripple and Robert Beschta from Oregon State University. In their paper in BioScience, the two researchers showed that the wolves was with increased growth of willow and cottonwood in the park. Why? Because grazing animals such as elk were sites from which they couldn’t easily escape, the scientists . And as the woody plants and trees grew taller and thicker, beaver expanded.