Burt, the 5.1-metre 700kg monster crocodile from the comedy adventure film, who starred alongside Paul Hogan, died in captivity in Darwin.

He was thought to have been over 90 years old.

Crocosaurus Cove, a crocodile herpetarium and aquarium attraction which had kept Burt in captivity since 2008, announced the reptile's death on Monday.

'It is with great sadness that we announce the passing of Burt, the iconic saltwater crocodile and star of the Australian classic Crocodile Dundee,' the facility posted on its Facebook page.

'Burt passed away peacefully over the weekend, estimated to be over 90 years old, marking the end of an incredible era.'

The herpetarium wrote a heartfelt tribute to the iconic creature, described as 'one of the most recognised crocodiles in the world'.

'Burt's life story is one of strength, resilience and a personality as bold as the Top End itself,' it wrote.

'Captured in the 1980s in the Reynolds River, Burt became one of the most recognised crocodiles in the world, appearing in Crocodile Dundee and helping to shape Australia's image as a land of rugged natural beauty and awe-inspiring wildlife.

'In 2008, Burt made his way to Crocosaurus Cove, where he became a fierce and fascinating ambassador for crocodile education. Known for his independent nature, Burt was a confirmed bachelor — an attitude he made clear during his earlier years at a crocodile farm.

'His fiery temperament earned him the respect of his caretakers and visitors alike, as he embodied the raw and untamed spirit of the saltwater crocodile.'

They continued: 'Burt was truly one of a kind. He wasn't just a crocodile; he was a force of nature and a reminder of the power and majesty of these incredible creatures.