the books have also been translated in Dutch. They are truly marvellous
Frank based his (fictituous) zoo on architecture in Vienna, Antwerp and Berlin Zoo (among others). While the story plays at the early 2Oth century, Frank designed huge immersion exhibits à la Burger's Bush, in an Art-Nouveau architecture setting, reminiscent of the winter gardens at Antwerp, Stuttgart, Berlin... Many animals roam free in rainforest exhibits, filled with interesting animal sculptures. Other parts in the fictive zoo are inspired by Hagenbeck or Vincennes.
The main character "Buggy", a sculptour, is based on Rembrandt Bugatti, the late Belgian "animalier", who used to sculpt animals at Antwerp ZOo - in the comic books, his sculptures play a vital role. Some of the sculptures are fictive too, but others, such as the baboon, are based on true works by Bugatti. Frank himself is also a sculptour, although the admits to be just an "amateur". His work "leaping tiger" also is featured in the comic books (the clouded leopard is sometimes referred to as tiger in the books, and also is more to a tiger in size than to a true clouded leopard).
On the site mentioned above, you can see that Frank was very much involved in drawin/designing the new asian village in Parc Paradisio. He has also worked on designing the zoo maps. On the site it is mentioned that the involvement of Frank has ended. The plans for a new "artistic" zoo are also discussed on the site, a preliminary map is provided. It shows camels, lemurs, and other animals. MOre details are given on "atelier zoo", which is a tropical house with fish and reptiles. Currently, a site of 1,5 hectares is being discussed and looks promising (according to the site) but there's still a lot of administration and legislation to plow through...
Apart from the Zoo series, Frank also drew comic books on "Brosailles" ("ragebol" in dutch), one episode plays in Japan, in Osaka Aquarium. Other adventures include the Brussels Natural History Museum, and the mountain gorillas in Rwanda. On the site mentioned above you can also find reference to this series.