A booze-pilfering drunken feral pig has caused chaos by running amok at an Australian campsite and starting a fight with a cow.

The belligerent porker went on a drunken bender after stealing and drinking three six-packs of beer that had been left out by campers at the DeGrey River campsite in Port Hedland, Australia.

In the predictable series of events that followed the animal went on to ransack rubbish bin bags to find some late-night snacks before starting a fight with an innocent eyewitness cow.

Following the boarish rampage the pig decided to swim out into the middle of a river before collapsing drunk under a tree and falling asleep.

One camper named Merida recounted the tale to the ABC network: "It was in the middle of the night and it was these people camping opposite us and they heard this crunching of the can and they got their torch out and shone it on the pig and there he was scrunching away at their cans."

"Then he went and raided their rubbish that they had sort of covered over with a bin as well.

"And then there was some other people camped right on the river and they saw him running around their vehicle being chased by a cow.

"It was going around and around and then it went into the river and swam across to the middle of the river.

"The people that were camped on the river went across and crept up on it and it was hiding and sleeping under a big log right on the edge of the water."