They reintroduced wolves into Yellowstone National Park in 1995 (the last wolves were killed in the 1920s) and the environmental chain reaction is extraordinary. Deer population was reduced, forests shot up, birds came back, beavers got busy, bear numbers increased, and ultimately the river changed course. It’s an uplifting story of possibility and hope that is well worth four and a half minutes to watch the video.
You can also read an update on the research project and science behind it.
