zoo classes in 1969. Around the same time, planetarium exhibits were installed. On 1 January 1983, the animal park was classified as a monument. Ten years later, its 150th anniversary was celebrated. In 1997, Vriesland (Freezeland) was opened. It houses subantarctic penguins and in the past also Alaskan sea otters. In spring 1999, the elephant compound was expanded. In 2003, many animals, including hippos, Malayan tapirs, and a number of swamp birds received a new home in Hippotopia. Animals and exhibits Together with its sister park Planckendael, Antwerp Zoo houses over 7,000 animals of about 950 species. Over 1.6 million people visit the zoo and Planckendael each year, and the zoo has around 200,000 supporting members. Some exhibits and species in the park include: Vriesland with king penguins, macaroni penguins, and gentoo penguins. A couple of sea otters has also lived here, but they were replaced by seals after the last one died. Aquaforum with California sea lions, used to house bottlenose dolphins up to 1999. Reptile house, renovated in 2005 with many species of snakes, lizards, turtles, and frogs, as well as caimans The over a century old renovated aquarium, with renovations completed in 2015, housing many species of saltwater and freshwater fish Nocturama with aardvarks, tamanduas, two-toed sloths, night monkeys, armadillos, slender lorises, lesser mouse-deer, rakalis, Philippine mouse-deer and Egyptian fruit bats Savannah aviary with African buffalos and several bird species including guineafowl, ibises and Abdim's storks Egyptian temple with Asian elephants, Hartmann's mountain zebras and giraffes, Aviaries and bird house with many birds species including military macaws, turacos, toucans, peafowls, pheasants and a large collection of Songbirds. Hippotopia with hippopotamus, malayan tapirs, dalmatian pelicans, Coypu and a couple of bird species Bearcanyon with spectacled bears, and coatis Cat enclosures with Amur leopard, lion and jaguar Flemish garden Kangaroo house with koalas and a tree-kangaroo Moorish temple with Okapis Monkey house with guereza, owl-faced monkey, javan lutung, emperor tamarin, black-headed spider monkey, golden-headed lion tamarin, pygmy marmoset, mandrill, Ring-tailed lemur and Black Lemur Ape house with chimpanzees, western lowland gorillas and the world's only eastern lowland gorilla in captivity outside of Africa. Birds of prey including snowy owl, spectacled owl, crested caracara, Kea and several vultures Other enclosures featuring harbour seal, bongo, meerkat, red panda, North American porcupine, American flamingo and African penguin All the animals in the zoo and Planckendael combined consume about 41 tons of fish,