About the shooting aspect: I have heard such remarks now and then in both American and European zoos, yet more often in American institutions. Usually, it's the typical male teen who wants to show his mates what a tough guy he is...
@Zooplantman: Thanks for posting the link. Some of the examples had a very familiar ring to me, some are new, but the Belted Galloway "Panda" surely takes the biscuit.
About the stupid questions, or rather stupid behaviour of visitors also mentioned in the link: of course this might serve as a basis to increase the knowledge and curiosity/will to learn, and of course nobody can claim omniscience for himself. But to be honest: some of the visitor comments are so plain stupid that You can't do anything else than laugh or bitch at them, depending on Your temper and the comment.
What makes me sad though is that all these beautiful informative signs, interactive consols, expensive TV documentaries, awesome non-fiction books or even (over)simplifying Internet information channels are not used-that the people are at least as or even dumber than their uneducated ancestors in the early decades of the very first zoos. After at least 100 (or even 250 in Vienna) years of zoo existence, the random visitor questions and remarks have changed only slightly if at all in comparison to the ones in the beginning of modern zoos. I sometimes even get the impression that some of the newer questions would have been considered as signs of a remarkable lack of common-sense back then.
And even if the kids are interested to learn, the first persons they turn to are usually their parents. And if the parents are less informed than their kids and unable/unwilling to simple switch on their brain for a second or two to look for a reasonable answer, I can't see any positive learning effect at all for all involved.
The current generation of parents and teachers are actually a weird breed; most of them grew up in a time when high-quality TV animal documentaries by Attenborough, Cousteau, Grzimek, Sielmann etc. ... started to launch, new updated non-fiction books for kids & adults and the very first zoo-education programmes came out and wild animals and exotic places like Africa were still considered "cool"... However, somewhere during their growing-up period this interest and knowledge in fauna & flora was erased and never came back, leaving only a few interested "infantile animal nerds" behind. Maybe it's due to the decrease of importance of this kind of knowledge in modern life, maybe "expert idiotism" is required in most fields of modern life and maybe the overflow of data just kills the natural curiosity and will to learn, no matter whether it's animals, arts, music or history...
All in all, these stupid and permanently echoed questions make me kind of doubt about the sustained yield of the current system of education in many countries...
Re: Nigel's older comment about making visitor-safe exhibits: that would often collide with the visitors' wish to see and get close to animals. And to be honest: it's hardly possible to avoid all possible risks, as a sane person often lacks the ability to imagine & forecast all the stupid things some people can come up with...