Two young black bears were spotted mockfighting in the woodlands at a nature reserve in Russia.

The pair were caught on a wildlife camera play grappling at the Sikhote-Alin Biosphere Reserve in Primorsky Krai, eastern Russia.

The black bears first sniffed out a tree, often used as a territory maker.

As they sized each other up, they quickly got onto their hind legs swinging their massive paws at each other.

But as they bit and grappled they seem careful not to hurt each other with their powerful jaws and razor-sharp claws.

Despite the fun, the skills they're learning will be used to deadly effect when they are competing for territory or breeding rights.

The reserve - a UNESCO World Heritage site - said in a statement: 'At this stage, what they are doing is fun and helps to pass the time.

'It also plays a vital role in helping them to develop the skills they need to survive in the wild.

'In doing this, young bears are sharpening the skills that they will need for hunting, fighting and breeding.

'As a result, they can be seen standing on their hind legs and practising moves to get the edge over their rival.

'But it's all done without any aggression and probably silently to avoid any nearby adults turning up and getting involved.'

They explained that it also helps bears - often solitary - to be more sociable with other animals and to bond.