Great white sharks are washing up dead on beaches with enlarged brains in what is becoming a spiralling marine mystery.

Scientists said the presence of killer whale DNA on the great white shark was the result of a "true predation event".

For the first time, DNA evidence has confirmed killer whales in Australia hunted a white shark for its liver. Based on DNA analysis from the bite wounds on the carcass of a large white shark washed as

Faced with a rash of shark deaths marked by brain swelling, Canadian and American scientists are trying to solve a marine mystery.

The recent autopsy of a partially devoured great white shark confirms a brutal hunting trend— killer whales around the world are not afraid to attack the fearsome fish, especially when they get a taste for liver.

Recent findings used wildlife forensics and citizen science data to provide the first confirmed evidence of killer whale predation on white sharks in Australia.