In science class we talked about how wolves changed rivers. It all started when people thought that wolves were bad and they did no good.
But then yellowstone reintroduced wolves and when they did the wolves killed a few deer but then the deer started to avoid that part of the valley and Yellowstone started to regenerate and after that the song birds started to come and the beavers came back 
because they like to eat trees, and the beavers built dams so more and more wildlife came. And the wolves killed coyotes so the number of rabbits and mice went up so that meant more hawks. Crows and eagles came down to feed on the dead animal that the wolves left and so did the bears so the bear population went up also because there were more berries on the trees. And most importantly the wolves changed rivers because there was less erosion because the roots stabilised the dirt and the there was no more dirt erosion because the vegetation stabilised it.
And that is how wolves changed rivers.
How many wolves were left in yellowstone?
What is a turtles shell made of?
How many elephants are left in the world?
Dylann, I liked your post because you explained how the popultion went up and down like how when the mice population go up so do the hawks. Great post!
Dylann, you really have a great understanding of what happened in the ecosystem and how much it was affected just by the introduction of the wolves! Great blog post!!!