For the first time in more than 100 years, Banff National Park in Canada is going to be home to wild bison.

A wild bison at Elk Island National Park. Photo from Johane Janelle/Parks Canada.

The Great Plains and eastern slopes of the Rockies were once home to as many as 60 million bison, but by the late 1800s, settlers and disease had almost wiped them out. In 1889, a prominent conservationist estimated only about 1,000 animals remained.

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Here are 5 times when humans helped Earth's creatures survive.

Sometimes in the course of human events, we screw things up. Sometimes we also realize what we've done and try to fix it.

Sometimes in the course of human events, we really really screw things up. Some of those screwups have small consequences. Others almost wipe out entire species.

Fortunately, sometimes we also realize what we've done and try to fix it. And even succeed.

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Discovery - Racing Extinction