November 2, 2012 -- Updated 1326 GMT (2126 HKT) ""In 2004 and 2005, Kim didn't even know that the human voice he heard at the zoo was actually from Koshik," zoo spokesman In Kim In Cherl said. Why do elephants have hair on their heads? Will elephants still roam earth in 20 years? November 2, 2012 -- Updated 1354 GMT (2154 HKT) November 2, 2012 -- Updated 1351 GMT (2151 HKT)