All of the animals at Indonesia's largest zoo - many of them critically endangered - could be dead within five years unless strong action is taken to change the culture of neglect and corruption that permeates the facility, a zoo official said Saturday. An endangered Sumatran tiger was found dead Saturday morning in its cage at the Surabaya Zoo, spokesman Agus Supangkat said. The remaining 13 Sumatran tigers are being kept in dirty, cramped cages and are also at great risk, said Tonny Sumampouw, the chairman of the country's zoo association who has been tasked with overseeing the facility after the government took it over earlier this year. In recent days, an African lion and an Australian kangaroo also have died, Sumampouw said. He said hundreds of animals die every year at the zoo, and others suffer from hunger, stress and overcrowding. The 94-year-old facility was built under Dutch colonial rule.