you know snow leopard, you are the first person from the northern hemishere on this forum who i have heard admit that really, zoos that find themselves knee deep in snow really can't provide for large tropical mammals.
i have always maintained a position that i think temperate zoos should focus (and that doesn't mean EXCLUSIVELY) on temperate species and warm weather zoos should focus on tropical and subtropical species.
usually i find myself up against americans and europeans aggressively defending their right to keep elephants and giraffes, though personally i think it comes down to a personal desire to see them on their part than a true belief that keeping them locked in barns for months on end is actually fair.
and the funny thing is - even though i say it goes both ways (i'm not a fan of polar bears on the queensland goldcoast either), it doesn't seem to get any levelof agreement, becase lets face it - most of our zoo favorites, gorillas, elephants, giraffe and rhino - all come from warm climates.
still. i'm unshaken. i don't much care how well they breed in europe. if you need to keep you elephants indoors for months on end then i really don't think you have a right to keep them.
I dare to state that the American & European zoos do not "aggressively" defend their "right" (if there is something like that at all) to keep exotic species because they enjoy tormenting animals and love keeping them indoors all the time. The reason for this is rather the factor that keeps zoos running-the paying audience. It's Your Average Joe who wants to see elephants, lions, zebras, giraffes, gorillas, hippos, crocs etc. All these species are nicely labelled in American "zoo-slang" as the "Charismatic Megafauna"-a term well fitting one might say. Additionally, smaller animals like monkeys, parrots, flamingos, kangaroos, iguanas are also popular-because they're vividly colourful, show interesting behaviour-and simply because they're EXOTIC-so to say unfamiliar for that particular local audience. The definition of being exotic is most often determined by the location where the subject is displayed and by the individual jugdement; for a European, an Australian Bearded Dragon is as much an exotic as a Roe Deer for an Australian-or Simmental Cattle for Indians...
Let's face it: in comparison to other continents, Africa still has most of the spectacular and popular larger vertebrates a zoo "should" have to please its visitors. And "Africa" in general is still considered an "exotic wild place" by the people of the 1.World.
When it comes to popular vertebrates, Asia, in comparison, does have quite a nice bunch of species to contribute to the popular "Megafauna" at the zoo-but they usually play second fiddle to Africa. This is even more true when it comes to the Americas and especially in the case of Europe. Keeping in mind that the most popular attractions in a zoo are large "wild" mammals, colourful birds, dangerous reptiles or funny monkeys (speaking from the average visitor's point of view), one can see that there isn't actually much of that among Europe's wildlife to qualify for that category. And that certain European species like said Roe Deer, Capercaillie or Ptarmigan aren't the easiest animals to be kept in a zoo doesn't help either.
There already exist quite a few European wild animal parks and zoos (Lohberg, Innsbruck etc.) mainly displaying European wild animals -but the zoos with the large numbers of visitors and the international fame are usually the ones in the big cities with the exotic animals. Therefore one can observe: in general, the zoo udience wants to see exotic animals, especially the "crowd-pleasers"-and is disappointed if these are not kept in the zoo they visit. Best example: Frankfurt Zoo wisely decided to quit keeping elephants due to not having enough space and ressources. Nowadays still visitors at Frankfurt zoo complain about not being able to watch elephants...
In another zoo forum (Animal knows what I'm talkin about), I speculated whether the display of animals in zoos would differ today if the giant Pleistocene Megafauna would not have died/ been wiped out, leaving only fragments in the form of the African, the Asian and the few Euroepan/American larger vetrebrates behind.
Maybe Europeans and Americans as well as Australians (who would f.e. keep Diprotodons instead of rhinos, maybe

) would not feel any need to see African larger mammals in their local zoo-as they would then have similar or even more spectacular animals "in their neighbourhood", growing up and being familiar to these. The "exotic" factor might jump in now and then (f.e. in thec ase of the Great Apes or the Giraffe), but most likely "Africa" as a theme wouldn't be so dominant in zoos (if zoos actually existed

) as it's today. Maybe Calgary would keep mastodons or megatheriums instead of elephants, and in Berlin "Knut" would be the name for a bottle-fed Cave Bear.

And tourists would travel to Kansas instead of Kenia to go on a big game safari...
However, this is just dreamful speculation. The reality is different: European & American big zoos need exotic animals-just like all the other zoos worldwide. And I think that considering the "ambassodor role" for their habitat and the educational and of the course the amusement value, exotic animals DO have a place in non-tropical zoos-and can most often be kept adequately.
In another topic I mentioned the term acclimatisation in connection with the ability of especially mammals to cope with different temperatures. This doesn't mean that You should keep a Bongo or a pygmy hippo outside all year long; it is rather based on observations considering the climate in the original habitats of certain species(!) and their behaviour in zoos in Europe or the USA. Zoos like Hamburg or Paris already kept this in mind in the late 19th and early 20th century: certain species like spotted hyenas, Bat-Eared foxes or addax antelopes actually seem not mind cold weather (as long as they have warm spot to get to once it's too cold) and grow quite thick fur in response to the cold. The key, however, to keeping these animals healthy while having them outside is resonsible management and the local humidity; it's most often the humid, not the dry cold which can lead to weather-related health problems.
One should also not assume that the location closer to the equator means that the weather there has to be always hot:
Desert as well as African savannah nights can be quite chilly; African animals like the African leopard, the Black Rhino and the African Hunting Dog have been observed in mountainous areas with snowfall in their natural habitat, and Striped Hyenas or Caracals f.e. have populations in areas wth much rougher climates than in say UK or Denmark. Not to mention African mountain animals like Geladas...
I do agree that it's a waste of money, energy and too much discomfort for the individual animal to keep species such as polar bears in Singapure or Australia ( I think btw that overheating is actually much more of a problem in many animals, even in temperate zoos in the summer-see Musk ox!) or large herds of elephants or huge crocodilians in temperate or highly cold climates, locked in most of the year. I do not, however, support the idea to force temperate zoos to keep only animals from temperate climates (I know You didn't say this, pat; I just wanted to state that in general); if said Bongo or Pygmy hippo can be kept comfortably and with not too much trouble in an European or American zoo (and is niot locked in all year long), that's fine with me. In the case of a conservation program with the actual goal to reintroduce the species or in teh case of the Canadian (or the single one kept in Alaska) elephants, I dare to differ and support the idea of keeping the animals at weather conditions closer to their natural habitat's.
And if zoos like Miami Metrozoo decide in consideration of their local climate just to keep tropical animals(and zoos like Korkeasarri prefer animals from colder climates), I do welcome the idea-just like I criticise LA getting Golden Snub-nosed monkeys or San Diego for having to keep Tundra animals in Sunny California.
One should not forget that the money of the visitors keep the zoo going. That doesn't mean that You have to keep elephants in a concrete "cupboard" or that every zoo should not take the local conditions into account when choosing animals.
However, the obvious appeal and preference of "exotic" in comparison to "native" species by most visitors (outside of Australia, maybe...) should not be forgotten.
As a fan of Asian animals from temperate or colder habitats, I could instantly name a bunch I'd love to see in zoos (unless they are, as it's quite often the case, already displayed). But this favoritism should not make me ignore that this is not shared by most of the visitors; their priorities in this case might be different from mine. Zoo fans might marvel at the sight of Shensi takins; for many visitors, these are just odd creatures that look like a large cross of a "goat-cow" and a Golden Retriever...and not half as interesting as the giraffes they, after looking for 5s at the takin, are more willing to see.
If I were a zoo director in a zoo in a colder climate, I would choose animals that are both well suited (and will cost me less money on heating

to the local weather AND have a general appeal to the public: Chilean or James' Flamingo instead of African/Cuban Flamingo, Bennett's wallaby instead of Roo, Amur tiger instead of Sumatran, Japanese Snow Monkey instead of Douc langur etc.; but a certain percentage of exotic tropical animals (kept in greenhouses etc.) is neverless unavoidable if trying to please most visitors.