How Reintroducing Wolves Changed Yellowstone's Ecosystem

Sustainable Human · Explainer · 5 min · 2014 · YouTube title: How Wolves Change Rivers

Why it's here

HN cites it as the go-to example of how one keystone species can reshape an entire ecosystem.

What it covers

George Monbiot narrates how reintroducing wolves to Yellowstone after about 70 years set off a trophic cascade. The wolves changed deer behavior, vegetation recovered, and rivers changed course.