In 2011, he earned a Guinness World Record as the largest crocodile in captivity. Marineland Melanesia shared on social media that Cassius was "our beloved mate" and "a cherished member of our family."
Before his captivity, Cassius was known in the wild for hunting cattle and damaging boat propellers, prompting his capture. George Craig, the founder of the sanctuary, bought Cassius in 1987. The sanctuary noted that Cassius "brought joy and companionship to his best mate George for over 37 years."