Largest Crocodile in Captivity in the World - Cassius

Cassius is the king of the crocodiles at Marineland Melanesia, where he has lived since 1987. This saltwater crocodile checks in at 5.48m long and weighs over 1 tonne. He is believed to be more than 110 years old.

So where did he come from? Before becoming the croc king of Green Island, Cassius was living in the Finnis River, just south of Darwin in the Northern Territory. As an apex predator, this big crocodile was getting 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.

The sheer size of Cassius is mind blowing and despite his advancing age, this monster saltwater croc is still growing, adding 18cm to his length between 1987 and 2010.

As well as being big and tough, Cassius is a truly beautiful animal, and his personality and appearance is unlike any other crocodile. Just by gazing at him you can tell he is wise in his old age, and he likes to keep a close watch on visitors, with his unflinching, golden eyes. You can spend as much time as you like with Cassius during the day, and learn more on a self-guided audio tour or by attending one of our presentations at 10.30am and 1.30pm. Seeing this living dinosaur in person will be one of the highlights of your time on Green Island.

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.