Mother Bear Fights to Raise Her Cubs in the Alaska Wilderness

Take a look behind the scenes of Disney's new true life nature adventure.
2:51 | 04/19/14

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Transcript for Mother Bear Fights to Raise Her Cubs in the Alaska Wilderness
Yeah. Bears fighting for survival in one of the harshest places on Earth. The music doesn't sound very harsh. This is actually a fascinating story on the front lines with these animals. A mother raising her inquisitive and playful young cubs in the wilderness of Alaska. They're the stars of "Bears," is a Disney nature true-life adventure. And I got a look at what it took to pull this project off. This new documentary called "Bears," follows a female brown bear and her two cubs through the first year of their life in the alaskan wilderness. And it is a treacherous year. This momma bear is keeping a good eye on her cubs. Reporter: Not only does the momma bear, who the filmmakers named sky, have to defend her cubs, named scout and amber, from predators. But she has to find enough food to sustain the family through next year's hibernation. Sometimes the search can be comical. Mom? Never mind, I got it. I'm fine. My claw -- mom, what do you do if your claw gets stuck in the clam? Let go. Reporter: You might recognize the guy who does the voiceover for this Disney nature documentary. It's John C. Reilly, who you might remember as porn star Reid Rothschild in "Boogie nights." Or race car driver, Cal Naughton Jr. In "Talledega nights." He brings the feisty male cub, scout, to life. He is looking for a role model. Which bear will he grow up to be. The male cub I related to because he's mischievous. And thinking he could do more than he's capable of. Reporter: To get this amazing footage, the filmmakers spent an entire year in Alaska's katmai wilderness and natural preserve. To get this close to them is a real special thing. And that's only good for the world to feel more sympathy for animals. I love those shots of the bears trying to get the fish as they play out of the water and hits them in the head. I know how that feels. Do you? Yeah. I've done a lot of fishing that way. Anyway. You can see the movie, opening tonight. It opened last night. If you go, Disney, which is the parent company of ABC, will make a donation to the national park foundation. A great cause. Those are cute, little cubs. John Riley, who knew? Never gone fishing like that? No. But my finger has gotten stuck in a clam before. That, I don't have a hard

This transcript has been automatically generated and may not be 100% accurate.

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