Onassis, a giant Amazon river turtle, has lived at the zoo since Valentine's Day 1969. She was named after shipping magnate Aristotle Onassis, who had married Jackie Kennedy a few months prior.

Aristotle Onassis had a longtime affair with opera singer Maria Callas that lasted until his death in 1975 at age 69. Callas is the subject of a biopic starring Angelina Jolie.

Jacqueline Kennedy Onassis lived all over, from New York apartments to East Coast mansions. She said her family's "happiest years" were those spent with President John F. Kennedy in the White House.

Jacqueline Kennedy Onassis lived all over, from New York apartments to East Coast mansions. She said her family's "happiest years" were those spent with President John F. Kennedy in the White ...

Aristotle Onassis and Maria Callas 'never stopped seeing each other,' even after his marriage to Jacqueline Kennedy, his longtime personal secretary Kiki Feroudi Moutsatsos tells PEOPLE.

Onassis himself gives the lie to all the myths when he states emphatically and a little impatiently, “They all say I was born in Salonika. I wasn’t.

Onassis married Jackie Kennedy, despite still having feelings for Callas. Reportedly, “within weeks after marrying Jackie in 1968, Onassis was back at Maria's doorstep in Paris 'shouting, ...

Onassis, a giant Amazon river turtle, has lived at the zoo since Valentine's Day 1969. She was named after shipping magnate Aristotle Onassis, who had married Jackie Kennedy a few months prior.

Onassis, a giant Amazon River turtle, has lived at the zoo since 1969. No one knows exactly how old she is, but she's still curious and healthy.