Lieber, a five-year-old hippopotamus, is seen after being administered a second dose of anaesthetic at the Ramat Gan Safari Park near Tel Aviv May 6, 2009. Lieber died in the safari park on Wednesday as he was being castrated by an international medical team. Sagit Horowitz, a spokeswoman for the safari, said four other males at the park survived their castration and another was scheduled to undergo the procedure later in the day. REUTERS/Gil Cohen Magen (ISRAEL ANIMALS ENVIRONMENT HEALTH)