** Scientists plan to analyze the bones of Cassius, a giant crocodile that died in Australia after 40 years in captivity. Estimated to be over 120 years old, the necropsy may reveal his true age by counting growth rings on his femur bone.

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Source: https://www.livescience.com/animals/alligators-crocodiles/scientists-to-read-cassius-the-giant-crocodiles-bones-to-find-out-exactly-how-old-he-was-when-he-died