The Park That Cried Wolf

This is an absolutely fascinating, 4-minute video produced for the TEDed by the Sustainable Human organization.  It tells about how re-introducing just a small number of wolves back into Yellowstone National Park, so much of the ecosystem changed for the better.  "How Wolves Change Rivers."

My favorite thing in it, just because it shows how good this is, is that you're watching this absolutely intrigued by the tale, and then at about the 3-minute mark the narrator says, "But here's where it gets really interesting."

Wait, hold on, you're saying it wasn't "really interesting" before??  It was remarkably interesting before!  But the thing is -- he's right.

https://www.youtube.com/watch?v=ysa5OBhXz-Q