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
Twycross Zoo all four types of great ape: gorilla, orangutan, chimpanzee and bonobo, the latter being the only bonobos in the country. The zoo currently houses four orangutans, five gorillas, 20 chimpanzees and 13 bonobos. Twycross Zoo has one of the largest collections of gibbons in Europe, and 37% of their animal collection is classed as near threatened, vulnerable, endangered or critically endangered by the IUCN. Many of the animals at Twycross Zoo are part of conservation breeding programmes which help ensure a future for species threatened with extinction. The animal exhibits at Twycross Zoo are split into eight zones: Conservation Way