Stacey Grenrock-Woods

From the bison to the elk, Yellowstone National Park is home to some of America's most spectacular wildlife.

But there's one amazing creature here that is in grave danger of extinction.

That creature, the snowmobile.

Years ago, the snowmobile roamed free in Yellowstone Park.

The natives called them Yamaha and used every part of them out of respect for the snowmobile.

Their numbers began to dwindle.

But then hope.

Environmentalist George W. Bush signed an order reintroducing these magnificent creatures into the delicate Yellowstone ecosystem.

Look right here, you can see fresh snowmobile tracks.

Let's follow them.

John Catton of the Greater Yellowstone Coalition describes the joy of having the snowmobile back in the park.

But there's good news.

This month has seen the birth of several snowmobile pups.

If the snowmobile is to flourish in the park, it will be because of people like Randy Robertson, who cares for them, tags them, and releases them.

What's this one's name?

Right.

Must be very scared.

Yes, scared.

Because if the snowmobile can't go into Yellowstone, it will have nowhere to go, except the 10,000 trails just outside the park.

On this magnificent day, Randy and I were lucky enough to release Trail Touring into the wild.