After being pursued up an icy mountain by an aggressive male, this mother polar bear creates a mini avalanche to save her cubs.
Nearing the summit, the family have become trapped.
The male sees his chance.
The cubs are panicking.
To escape, they must somehow scale the wall of ice and snow.
But he's matching them step for step The stronger male cub is keeping up. His sister struggles.
Their mother has paved the way, now it's all down to her cubs.
With one last effort the little one is up, but the male is grappling with the steepest part.
Now she has the advantage.
Time to strike!
For the male, there's no dignified way to do this.