Erfurt has some interesting species, and some, like in the case of the newer colobus exhibits, are even well exhibited. Nevertheless, I have been to quite a bunch of smaller zoos where the "only" aspect in regard to common pet species is quite true-and these "extremes" should not be neglected when making generalising statements like "I don't care what animals are in a zoo". Additionally, I do get the impression that in a not too small amount of zoos, it has become quite common to fill "vacant positions" with most common species You can also find at more and more private households. The aspect that more and more exotic species are kept privately shouldn't be neglected, neither in this context.
Of course, people will still go to a zoo with just pets, people can relate to these animals, it's good when just the animals that can be properly housed are displayed, blablablabla...However, the Erfurt small mammal house (not the overal zoo) is a good example; when I went there f.e. in the early 90's, they had an interesting collection including bushbabies, bats, kinkajous, night herons etc. Now it's zebra finches, gerbils and Bearded Dragons...yippee. Very similar to the new "zoo" I recently visited in Aying; You better visit the local brewery and the restaurant with the giant schnitzels instead...

In my humble opinion, it'd be just a waste of ressources and professionals if this tendency would continue to spread in zoos...And even the dumbest zoo visitors, who just goes to a zoo, no matter what it offers, might find himself after a while no longer attracted to a zoo collection that is less exotic than what he keeps at home...
Of course this saying doesn't apply to monkey kings; if someone can live with a mountain topped on him, he can do well with a closed flap, too...
