Expert explains why orcas kill great white sharks after attack caught on camera

A marine expert has revealed why an orca targeted a great white shark in an "unprecedented" killing caught on camera off the coast of South Africa.

Footage showed a killer whale striking the shark on its pectoral fin before extracting the fish’s nutrient-rich liver - the organ is an incentive for the killing, according to experts.

Shark biologist Alison Towner told Sky News: "Shark livers are huge... they are packed full of oils and lipids.

"Killer whales are so specialised and so efficient at what they do - they often take a specific portion of their prey and discard the rest."