Enormous kangaroo bathes his bulging muscles in an Outback river

A very muscular kangaroo has been spotted taking a dip in a river in Western Australia.

The giant boomer was pictured having a splash in the Boodjidup Creek, in Margaret River, about four hours south of Perth.  

The majestic marsupial offered a defiant expression as it stood in waist-deep water and looked straight down the lens of the camera, its arm and chest muscles bulging

Multiple photos of the rare event were shared to Facebook on Wednesday and quickly attracted more than 850 likes and nearly 3,000 shares.

More than 600 people commented on the bizarre occurrence, with many people expressing disbelief at the animal's physique.

The kangaroo appeared a bit off-put that his river bath had been interrupted, sporting a rather displeased look as it glared at the human intruders.

Many pointed out the buck's impressive physique and its threatening stance, despite most of its body being submerged.

'Wow, what a brilliant powerful roo. Look at his paws and claws. Have you ever seen a roo that big,' one social media user wrote.

Another put themselves in the kangaroo's place, writing: 'Are you right mate!! I’m trying to have a bath here, fair dinkum.' 

Some speculated the photographer's pet dog had chased the creature into the river.

It was also suggested bucks used standing in water as a tactic to entice dogs towards them, making it easy for them to plan an attack. 

Others pointed out the strangely human exoression on the animal's face.