Sofia Zoo marmoset, and macaques. The predator sector houses big cats, bears and small predators, including lions, tigers, leopards, pumas and brown bears. In January 2011 the zoo received eight Humboldt penguins on loan from Germany. The penguins are on loan for about 18 months, after which they will be returned, with any offspring to stay at the zoo. The zoo has some 1,400 individual birds representing 192 species. Waterbirds are housed in a lake, and Imperial eagles, Griffon vultures, Egyptian vultures and buzzards in a large walk-through aviary. Other species of birds at the zoo include ostriches, Silver pheasants, peacocks, flamingos,
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,