Largest Crocodile in Captivity in the World - Cassius

Cassius was the king of the crocodiles at Marineland Melanesia, where he lived from 1987 until his passing in 2024. Cassius checked in at 5.48m long and weighed over 1 tonne. He is believed to have lived for more than 110 years.

Before becoming the croc king of Green Island, Cassius lived in the Finnis River, just south of Darwin in the Northern Territory. As an apex predator, this big crocodile got into all sorts of trouble, from catching and eating cattle to attacking boat propellers. It is believed this is where and how he sustained his many battle scars, including losing his front left leg, part of his snout and around 15cm off the end of his tail. When he was captured, Cassius was trucked 3,000km over dusty roads to Cairns and then brought to Green Island by boat. This is where he remained until his passing in 2024. As a beloved resident of Marineland Melanesia for all those years, we look forward to opening a new exhibit in his honour in 2025 – Cassius Forever.

The sheer size of Cassius was mind blowing! As was the fact that he continued to keep growing well into his senior years, adding around 18cm to his length between 1987 and 2010.

Cassius was big and tough, and a truly beautiful animal, with a personality and appearance unlike any other crocodile we have ever seen or encountered. That is why he will always be remembered and celebrated here at Marineland Melanesia, with our special Cassius Forever exhibit which is coming soon in 2025.

In the meantime, all of our other crocodiles appreciate your support and would love to meet you. So we look forward to seeing you soon at Marineland Melanesia.

We are located on Green Island, in the beautiful Great Barrier Reef, just a short boat ride from Cairns and five minute stroll from the Green Island jetty.

Marineland Melanesia Crocodile Habitat is open 7 days a week, from 9am to 4pm. Your admission ticket provides you with entry throughout the day, so you can come and go as you please.