Surabaya Zoo performed on the animals found plastic and wood inside the animals. The death of Melani the tiger, one of only a few hundred Sumatran tigers left in the world, outraged animal activists when it was discovered that the tiger was suffering from extreme digestive disorders before being rescued from the zoo. On 28 January 2014 Surabaya Zoo authority announced that the zoo has a collection of 3,459 animals from 197 species, but 81 animals are sick, disabled, and old, and 44 of which are in severe conditions. An online petition that calls for the closure of Surabaya Zoo due to
History of Edinburgh Zoo chimpanzees at Edinburgh were found to use word-like vocal labels for food. In late 2005 the Animal Liberation Front (ALF) threatened action over the holding in captivity of Mercedes, then Britain's only polar bear. The zoo had initially planned to retire their polar bear exhibit after Mercedes died. When zoo officials announced plans to create a new attraction, citing their responsibility to ensure the survival of the species, the ALF threatened damage to zoo workers' property and other scare-tactics. Edinburgh's treatment of polar bears had often been subject to criticism, punctuated by incidents like the death in 1997 of Mercedes'