Climbing Back Up: The Return of The Northwest's Fishers

A century ago, the fisher was trapped to extinction in Washington State's Cascade mountains.

Now, the cat-sized tree climber is mounting its comeback, inspiring one of the largest species reintroduction projects in the Pacific Northwest. Scientists are releasing them into the mountains and tracking their survival.

We follow a group of scientists on a years-long monitoring project to see if the fisher is successfully taking to its new home.