One polar bear mom must defend her cubs when the aggressive males threaten to attack them. ➡ Subscribe: bit.ly/NatGeoWILDSubscribe ➡ Watch all clips of Mission Critical here: bit.ly/WatchMissionCritical ➡ Get More Mission Critical: bit.ly/NGWMissionCritical ➡MISSION CRITICAL: ANIMALS OF THE YEAR AIRS SUNDAY APRIL 23 at 8/7c. About Mission Critical : When National Geographic photographers go on assignment, it’s not just a job—it’s a mission. Covering stories that are as urgent as they are timeless, they travel to every corner of the globe to show us what we need to know now—to save iconic species from extinction, protect ourselves, and make way for a better, more sustainable planet. This time, they’re taking you along for the ride! Get More Nat Geo Wild: Official Site: bit.ly/NatGeoWILD Facebook: bit.ly/NGWFacebook Twitter: bit.ly/NGWTwitter Instagram: bit.ly/NGWInstagram About Nat Geo Wild: Welcome to a place so wild, anything can happen. Nat Geo Wild is the network all about animals from National Geographic, where every story is an adventure and your imagination is allowed to run wild. Polar Bear Mom Fights Back | Mission Critical youtu.be/4oWeNg3ndtc Nat Geo Wild www.youtube.com/user/NatGeoWild