Want More Positive Stories Like This One?

Step 1:Like Us!

Step 2:Join Our Newsletter

How Wolves Changed Rivers In Yellowstone Park.

After being absent for nearly 70 years, wolves were reintroduced to the Yellowstone National Park and the most extraordinary trophic cascade occurred. George Monbiot explains what a trophic cascade is and how the wolves changed the rivers.

Note: There are “elk” pictured in this video when the narrator is referring to “deer.” This is because the narrator is British and the British word for “elk” is “red deer” or “deer” for short.

Join The LifeBuzz Community

Sign Up For LifeBuzz

Log In To LifeBuzz

Forgot Your Password?

If you forgot your password, use this form and we'll send you an email with your username and a link to reset your password

Additional Authentication Required

All LifeBuzz staff must complete extra verification. First, download the Google Authenticator app for iPhone or Android. Scan the QR code below to add LifeBuzz to the app, then enter the 6-digit code you are given below, and hit Authorize. Once you are verified, you must have your phone with you to log into the LifeBuzz administration area.