Locals in Queensland’s far north aren’t afraid to share a river with Brutus, a massive 5.2-metre croc.

He’s longer than a Land Cruiser and could be Queensland’s largest wild croc.

When Brutus, the 5.2-metre reptile, cruises a river in the state’s far north, the other crocodiles know who’s boss.

“They go very still when he comes up the river,” Cape Tribulation tour guide Mike D’Arcy told AAP.

“He’s so big and ferocious there’s hardly any confrontations.

“But every now and then you hear a great roaring of crocs fighting.”

Brutus is often spotted relaxing on warm rocks on the Bloomfield River, north of Cairns.

Mr D’Arcy says he hasn’t seen bigger in his five years running D’Arcy of Daintree 4WD Tours.

Up to 15 adult crocs at any one time cruise the river, where a croc just slightly smaller than Brutus was spotted this week.

But that doesn’t put locals off swimming nearby.

Traditional owner and former Wujal Wujal mayor Desmond Tayley said indigenous people knew a croc was nearby whenever a bird called out.

“You learn to live with the animal and respect it,” he said.

Residents don’t want the crocs removed, as people have lived alongside the reptiles for many years, he added.

A croc hadn’t attacked someone in the Bloomfield River since 1945, although a horse was fatally wounded earlier this year, Mr D’Arcy said.

A 5.48 metre giant croc called Cassius, who lives on Queensland’s Green Island, is considered the largest saltwater croc in captivity.

He celebrated his 110th birthday last year by devouring a 20kg chicken neck cake.