A video showing a bear rescuing her young cub stuck up a tree is becoming an Internet sensation.
The 'Mama bear' clip uploaded to the popular video sharing site YouTube, has been watched more than 300,000 times.
Shot at Switzerland's Bear Park, the footage shows a bear named Bjork with her two cubs. But one has climbed a tree and looks unable to climb down.
Bjork, whose name translates as birch in English according to Bear Park, is seen rescuing her cub by breaking the sapling.