[1] The animal measured 5.48 metres (18 ft 0 in) in length, weighed approximately 1,300 kilograms (2,870 lb),[2][1] and was kept at the Marineland Crocodile Park, a zoo on Green Island, Queensland, Australia.

Cassius was officially recognized by Guinness in 2011, but lost the title in 2012 to Lolong, a 6.17 m (20 ft 3 in)[3] saltwater crocodile caught in the southern Philippines.

Samples of Cassius' body were sent away in an attempt to determine his age, and his skin and head have been preserved.

[7] Cassius was known as a problem animal that attacked boats in the Northern Territory's Finniss River and was captured in 1984.

[8] Three years later, he was brought to Green Island by crocodile hunter George Craig, who had opened Marineland Melanesia in 1969.