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The gray wolf restoration project at Yellowstone National Park is one of the leading predator reintroduction projects in the world and one of the most controversial.To investigate the effects of predation on the park, researchers accurately record the crucial data to be found at wolf kill sites.

In this case, the remains of a young elk are found. The leader of the project, Dr Doug Smith, reveals that instead of this being a negative event, predation is actually a positive force that controls elk populations and contributes to the overall health of the elk herds there.