Wolves are definitely a Keystone Species in Yellowstone National Park, especially since they influence populations of Beavers. They are in their own right also a Keystone Species because of their ability to greatly modify their habitats. Here's SciShow's fun facts about Beavers.
Had we been in school we would've watched the PBS Nature documentary 'Leave it to Beavers'. Sadly we are not, but here's a snippet of the show.
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