By Mark Morris
This rare footage shows two incredibly energetic polar cubs playing and messing around off the coast of Russia.
The high-definition video was captured by wildlife photographer and videographer Graham Boulnois last year.
It shows the cubs, who are siblings, messing around in and around the sea near Wrangel Island in the Russian far east.
Play fighting is a common behaviour for polar bear cubs, particularly male siblings, but it’s not often caught on camera in such brilliant, high quality.
“What fun to watch their antics,” Graham added.