For a major European zoo, there are still a few of the larger Cologne exhibits that are not represented in the gallery, among others the whole Clemenshof area. I'll try to complete the "collection".
Clemenshof is the children's/petting zoo of Cologne Zoo, housing all of the zoo's domestics and opened in 2014. For a children's zoo, it's relatively well-done (if you can stand some thematization), even though children's zoos probably aren't the places where most of us spend the most time.