The reintroduction of wolves in Yellowstone

Level: Intermediate / B1

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Here is another great video from the BBC's Power of Nature series. Called Wolves: Forest Stewards it looks at the reintroduction of wolves in Yellowstone National Park.

Watch the video (four minutes long) and read the text with it, then answer the following questions:
1) When did wolves become extinct in Yellowstone?
2) Why were wolves reintroduced to the Park?
3) Which tree species started coming back?
4) What effect did the returning trees have?
5) What other species returned?


Answers below!



ANSWERS!

1) In the 1920s / Over 70 years ago
2) To manage the rising population of Elk (Cervus canadensis)
Note: This is the American Elk, similar to the European Red Deer (Cervus elaphus) . In Europe the Elk is what Americans call Moose (Alces alces)
3) Cottonwoods, Aspens, Poplars.
4) They stabilised the river banks, slowing and cleaning the water.
5) Beavers.