Far less well known are the breeding successes in other areas, for example, with fossas (carnivorous mammals from Madagascar) and red river hogs.

The zoo is located in the northern part of the Duisburg urban forest on the border with Mülheim on the Ruhr.

Federal highway A 3 divides the zoo into western and an eastern parts, which are joined by a leafy country bridge.

Director Wolfgang Gewalt drew similarly vehement criticism for leading an expedition to supply the zoo with a white whale.

In recent years, the zoo made efforts to renovate its antiquated enclosures, which caused many species, for example the polar bears, to be given up; there remain facilities which do not meet contemporary standards.

The Dolphinarium is inhabited by 7 bottle-nosed dolphins : Ivo (M), Pepina (F), Delphi (F), Daisy (F), Dörte (F), Debbie (F) and Dobbie (M).

It regularly offers special treats, such as "An Evening with the Dolphins" or "Zookeeper for a Day" and weddings or children's birthday parties can be celebrated there.

In a large pool lived the Amazon river dolphin Baby - which was the only of its kind in Europe.

The pool was constructed to look almost natural, and is separated from the viewing area by a curved, meter-high glass plate.

The pool was not intended to be exclusively used for the Amazon river dolphin - the plans are that it will be used in the future by other species after Baby's death.

Other animals in this section include orangutans, macaques, gibbons, sloths, and pygmy hippos.

Previously, the tortoises were housed in the same building as the aquarium, where they had a large enclosure strewn with sand and into which warming lamps were placed.