Ashton Webster was walking his dogs near his home in Foster, Victoria when he stumbled across an unusual sight: two wrestling koalas.

The koalas were so engrossed in combat, they didn't notice two dogs and Mr Webster standing only metres away.

In the video that Mr Webster filmed, the marsupials can be seen biting, clawing and lunging at each other.

At point, one of the koalas flips its opponent onto their back and bites them. The other koala desperately tries to claw itself out of the situation, but is clearly the 'loser' this time round.

Koalas are usually passive creatures, but come mating time, they'll become highly territorial and aggressive.