I hope this will interest you: I know that the size of an exhibit at a zoo isn´t the only important factor for the animals welfare, but I do find it to be very important, indeed. In my country, Sweden, we have legislation on the minimal exhibit area that is allowed for the holding of wild animals. Regarding some species, it is also regulated that the exhibit must give them climbing or digging possibilities and the likes of that. These regulations of course prevents the existence of crappy “roadside zoos” as well as private individuals from keeping exotic animals as pets in the backyard. I find all this excellent and will list some examples below. I would very much like to know if similar legislation exists in other countries? First though, for the very few who might understand Swedish, here is a link to the particular law: http://www.sjv.se/download/18.7502f61001ea08a0c7fff45617/2003-077.PDF So here is my list of examples. Please note that for NONE of these animals is it allowed to only exhibit them indoors. ALL must have access to outdoors enclosures! I have not necessarily mentioned all rules and regulations, for instance there are for all - or practically all - species regulations on the minimum size of BOTH indoors and outdoors exhibit area AND for off exhibit/night stable area. Anyway, here we go: Species/minimum exhibit area/examples of other regulations: Cat species weighing more than 100 kilos, (lions and tigers)/indoors exhibit 100 square meters, outdoors exhibit 1000 square meters with different ground levels and vertical logs to climb (mesh cages not allowed), night stable 6 square meters per individual and a minimum of 24 square meters Cat species between 30 to 100 kilos, for instance leopards/outdoors exhibit 1000 square meters or 500 square meters if the exhibit is a mesh cage with a minimum height of 5 meters/regulations on climbing possibilities etc Cat species between 5 and 30 kilos, for instance ozelots/outdoor exhibit 500 square meters/ lots of other requirements Wolf, Hyena etc/outdoor exhibits 2000 square meters Brown bear/outdoors exhibit 1500 square meters Polar Bear/outdoors exhibit 1500 square meters including pond 600 square meters with minimum depth of 3 meters Elephants/indoors exhibit 50 square meters per individual with a minimum of 200 square meters (floors must be heated), outdoors exhibit 4000 square meters Zebras (and similar animals), outdoors exhibit 2500 square meters Hippo: outdoors exhibit 2500 square meters including pond 200 square meters with minimum depth of 1,5 meters Chimps, Gorillas and Orang-Utangs/ indoors exhibit 150 square meters, 1000 cubic meters and a ceiling height of at least 5 meters, outdoors exhibits 500 square meters or 1000 square meters if the enclosure is a mesh cage/ a lot of climbing possibilities etc I could go on and on, but here I have shown you some interesting examples, I think. Many of these MINIMUM STANDARDS in Sweden far exceeds what you get to see when you visit an old inner city zoo in Western Europe, I am sorry to say. In fact, quite a few of the exhibits in my own “home zoo” – Copenhagen – would be considered literally criminal in Sweden. (I live in Sweden but Copenhagen is the zoo closest to me…). Almost every exhibit of bigger mammals would be shut down by law. Please comment, everybody!