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The loss of top predators, whether it's wolves in Yellowstone or cougars in Yosemite, is having a severe and degrading impact on plant communities
Loss of cougars changes Yosemite ecology May 03, 2008
Wolves were last found in Scotland more than 250 years ago, and as a result it's likely that very few natural areas now bear much resemblance to their native conditions
Wolf project considered in Scotland Jul 21, 2009