The first 'celebrity animal' that comes to my mind is the renowned walrus Antje that lived up to the age of 27 while residing in the even more renowned (old) Eismeer in Tierpark Hagenbeck.
She was of impressive size, in particular her tusks were extraordinary large for a female walrus kept in captivity, up to a point where rumors existed stating that Antje was a male specimen, though later on these rumors were easily refuted. Yet her fame is mostly based on her media presence, since she was the mascott of the german tv broadcaster NDR during the 80's, which made her an important figure in German tv shows, books and merchandising, aswell as in the zoo with performances and shows. Unfortunately, I could never witness Antje in her lifetime, but atleast I was able to meet her in Hamburg's Zoologiscal Museum, where she is displayed and can therefore still be admired up to this day.
Hence I would consider Antje an exemplary 'Famous Zoo Animal', when you come to think of the impressive influence in German media, especially in northern Germany, aswell as the meaning Antje carries for the facility Tierpark Hagenbeck, once again underlining the celebrity status.
Aus dem Leben eines tierischen Fernsehstars
Entscheidung für ein neues Naturkundemuseum : LIB