Incredibly, dolphins formed a protective circle around him, scaring off the ocean predator.

They are short-lived, and go mostly unnoticed by humans, apart from an occasional support role in a documentary about a great ocean predator.

Ninety per cent of ocean predators are already gone, replaced by jellyfish and squid.

These ocean predators act like drift nets, spreading their tentacles to catch plankton.

Large ocean predators, such as salmon and tuna, can migrate thousands of kilometres, crossing oceans.