This is the astonishing moment that a shark and crocodile were seen feasting on a humpback whale carcass.

A lucky skipper was treated to the incredibly rare spectacle on Tuesday when the tourist cruise he was on floated near a huge dead humpback whale on the remote Montgomery Reef in northern Western Australia.

As the vessel drew closer, Jeremy Tucker rushed to launch a drone to record footage of the unusual, gruesome dinner party where a saltwater crocodile and a tiger shark were feeding side-by-side.

A huge humpback whale carcass provides a feast for a hungry saltwater croc and a tiger shark

'It was really interesting to see how the crocodile and the tiger shark were interacting,' he said.

And Mr Tucker said that sights like this will probably become more frequent as the whale population successfully returning to pre-hunting levels, according to the ABC.

Australia's west coast humpback whale population is now regarded as one of the healthiest in the world.

The population boom is also providing more frequent feasts for animals that feed on the whales as they migrate between Antarctica and the Kimberley, so tourists out on the reef can expect to see plenty of wildlife in the water.