Giant crocodile and bull shark clash in northern Australian river

Tourists in northern Australia have witnessed a clash of two of nature's fiercest predators, with a massive saltwater crocodile wrestling with a bull shark in its jaws.

Andrew Paice was on an hour-long wildlife cruise on the Adelaide River in the Northern Territory with his partner and seven-year-old daughter on Tuesday when they spotted something unusual on the river bank.

Earlier they had watched as crocodiles, including the huge 5.5-metre male known as Brutus, leapt out of the water to eat pieces of buffalo meat held out on a pole.

"It was on the way back to the jetty, we went past Brutus again, he was up on the bank," Paice said from Kakadu National Park.

"As we were going past, we noticed that there was a fin. We thought it was a barramundi [fish] or something. The guide took the boat in for a closer look and lo' and behold, it was a shark."

Brutus, who is thought to be about 80 years old and is missing a front leg and most of his teeth, is well known in the area. Speculation is that the prospect of a fish dinner was tasty revenge for the crocodile, who was thought to have lost his limb to one of the sharks who inhabit nearby waters.