An amazing drone video has emerged from Australia of a huge crocodile feasting on a cow it dragged off a river bank.

The footage, which was filmed on The Kimberley, Western Australia on July 21, shows the 5-6 metre reptile swimming with the fully grown cow between its jaws.

"We followed him with the drone as it dragged the cow down river. It eventually got fed up with the drone buzzing over him and tried to pull the cow underwater," the filmer wrote online.