52 tons of meat, 37 tons of apples, 36 tons of carrots, 128 tons of hay, 4,000 litres of milk, 23,000 eggs, and 10,000 loaves of bread [in what period?]. The zoo used to have a dolphinarium called the Aquaforum. At the time of its building, one of the most modern of its kind. Over the years, however, the infrastructure was considered far too small and dated. The zoo's urban location prevented any expansion and meant the society could not build a new one. In 1999 the two dolphins were relocated to the Duisburg Zoo in Germany because of the new national standards for exhibits, with the exhibit too shallow to keep housing dolphins. The Aquaforum now hold sea lions, which are much less demanding. List of animals of Zoo Antwerp Architecture and garden Antwerp Zoo is one of the oldest zoos in the world, established in 1843. Many buildings are very well preserved. Some of them have received new functions throughout the years. Entrance of the zoo (1843) Egyptian temple (1856) Moor temple (1885): it still houses okapis. Antwerp Zoo became the world's first zoo with okapis in 1918. Bird building (1948) Nocturama (1968) Reptile building (1901): this building looks like a Greek temple. Aquarium (1910): designed by Emile Thielens. Winter garden (1897): a tropical greenhouse. On January 1, 1983, the entire park (architecture and garden) was listed as a monument. Breeding programmes Antwerp Zoo has played its role in preservation and breeding programmes for several endangered species, including the okapi, the Przewalski horse, the Congo peafowl, the bonobo, the golden-headed lion tamarin, the European otter, and the Knysna seahorse. They take part in the European Endangered Species Programme. Centre for Research and Conservation (CRC) The Centre for Research and Conservation is an important research department of the Royal Zoological Society of Antwerp. The CRC is not a separate research institute, but is very much embedded in the structure and functioning of the society. Research takes place at Antwerp Zoo, at the Wild Animal Park Planckendael, in other zoos and associated institutions, in situ in Cameroon with the Projet Grands Singes, in Brazil with BioBrasil, and in the RZSA's own wetland nature reserve "De Zegge" in Belgium. For all research fields, the CRC combines strictly zoo-related research and fundamental research, and reports to scientists in peer reviewed journals as well as to the general public. The conservation of wildlife