The old Ape House, opened in 1973, was one of the most modern of its kind at the time. The building's design, since copied by numerous other zoos and again mimicked in the new ape house, was characterized by features like the carousel-style design of the enclosure and the tiles that line them and the specialized support disks that allowed increased force distribution. The last two chimpanzees at Wilhelma were acquired in the summer of 2010 due to European Endangered Species Programme drive begun at Veszprém. Since the opening of the new ape house, the old house has been used exclusively for the zoo's orangutans. In 2011, it was announced that the zoo wished to remodel the enclosures of the orangutans, lutungs and gibbons.