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
London Zoo arapaimas and ocellate river stingrays. As well as the three halls, the aquarium also features the "Big Fish Tank", which contains large fish species that are all former pets, and had to be rescued because their owners did not have the proper equipment or understanding to look after them. The species in the Big Fish Tank include tambaqui, catfish and pirapitinga. Animal Adventure (formerly called the Ambika Paul Children's Zoo) opened in 2009 and is an area aimed primarily at children, featuring playgrounds and a water fountain. Many of the animals in Animal Adventure are domestic animals, such as sheep,