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Five neighbouring, but spatially separated net tents were constructed on a surface of about 8,000 square metres. The properties of Webnet in this application is ideal for man and animal: The primary supporting structure for the nets is formed in each case by three-armed, heavily cantilevered, steel-reinforced concrete pylons, so-called tri-digits, which have a height of nearly 20 metres. They are securely anchored in the ground by means of a concrete foundation and underground bored piles reaching a depth of up to 17 metres. Depending on the size, two or three of these bundled supports are located in each enclosure and they are fully integrated in the enclosure design. This space-saving style of construction gives the animals a much larger living space and the supports and nets are used avidly by the monkeys for climbing. Another unique aspect is the double-layer design of the project. While the inner, fine-meshed net structure surrounds the actual animal enclosure, the outer shell serves as a climbing support for creepers and climbing plants. The resulting vertical green surfaces attaining a height of up to 20 metres not only provide a visual highlight, but also serve as a source of shade for the primates and imitate their natural, tropical habitat. In order to give zoo visitors views into the enclosure from different perspectives in spite of the lush green, specific areas were set aside for this purpose.
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