If I was to drive from Calais to Berlin, with a single stop on the way before returning via Gelsenkirchen (only to see the dwarf Polar Bear really) and a couple of dutch zoos, where would you suggest I go?
Burgers Zoo, Apenheul, Diergaarde Blijdorp are arguably the 3 Dutch zoos you should not miss, though if you are keen on seeing tarsiers, visit Ouwehands as well... In that part of Germany Cologne and Duisburg (mainly for the river dolphin) are the main targets