A crafty crab carried a jellyfish over its head to protect itself from aerial attacks from predators.

Award winning diver Yury Ivanov was on a night dive off the Indonesia island of Bali when he came across the incredibly rare sight of two animals working together.

Fascinating footage - viewed more than 1.5million times - shows a sea urchin crab carrying an upside-down jellyfish on its back using the predators as a hiding place from attackers.

The jellyfish – so named because its mouth is facing upwards – have a second symbiotic relationship which means they must lie in areas with lots of light to be able to fuel their energy source.

Yury said: “This was an incredibly rare sighting. I have done more than 12,000 hours diving underwater and have only seen this behaviour a couple of times.

“The crab has a special pair of legs on its back so they can carry the jellyfish in this way.

“Ordinarily they will carry sea urchins on their back for protection, but in a few cases they will use jellyfish as camouflage instead.

“I spend 300 days of the year diving, mainly off Bali.”