How the wolves changed rivers.
This is about how the wolves changed rivers and changed the ecosystem.
First of before the wolves came the deer were eating all the trees. When the wolves came a number of changes happened.
The first notible change was that the deer started to avoid certain parts of the park. This lead to a more major change. In the area's that they avoided there were a lot more plants and trees.
When those plants sprang up a whole lot more animals sprang up as well and because of all the new animals they changed the activity of the rivers. That is why the wolves affect was so amazing.
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