The wild photo – snapped in Queensland – has been shared more than 1,400 times on Facebook, and has attracted hundreds of comments.
It was posted on the social media platform by stunned Timothee Morrison Dufour.
“Another wild day on the Gold Coast,” he wrote.
“Bull Shark in the backyard at Burleigh Waters.”
The shark is believed to have found its way into a canal in Burleigh Waters, which had swollen its banks after heavy rainfall in the area, reports news.com.au.
Due to their aggressive nature, experts consider bull sharks to be the most dangerous of sharks in the world, according to National Geographic.
The predators – which can grow up to 11.5ft – can often be found cruising shallow waters in search of prey.
Bull sharks are joined by their more famous cousins, great whites and tiger sharks, as the three species most likely to attack humans.
“How did it get there? Clearly sharknado,” one commenter joked.
“North QLD get crocs, the Gold Coast gets bull sharks,” one person wrote.
“This little guy at Burleigh Heads is enjoying his new pond.”
“I was fishing near there with my grandson last year and something big took his bait and ran his line out. Didn‘t think much of it at the time. Don’t think I’d go swimming near there any time soon,” another man wrote.
But some weren’t entirely convinced, with one man suggesting it looked like a “palm frond” floating in the water.
The Bureau of Meteorology in Queensland issued a severe thunderstorm warning for the state yesterday – which included the Gold Coast, the Sunshine Coast and the Scenic Rim.
The BOM predicted storms with heavy rain, which could lead to flash flooding, along with more intense periods of rain in the afternoon.
Burleigh Waters was pelted with 104mm of rain in the last 24 hours.
It comes just days after a massive 16ft great white shark was captured and tagged by marine experts.
The dramatic scenes were filmed just off the coast of Cottesloe Beach in Perth – with swimmers ordered to exit the water immediately.