The difficulty of keeping animals in captivity.

I suppose then you're grouping difficult to keep animals based on how long we can keep them, with ones we can keep long-term with some difficulty, ones we can only keep temporarily, and ones we can't keep at all.
Yes, that's the general idea.
 
  • The no-no ones: doesn't matter what you do, they'll die in a few days or hours. Ex: Narwhals (they will die out of stress).

Maybe you should do some more research before starting a thread. Within two minute research at Zootierliste you could have found out, that a narwahl was kept for 4 months at Vancouver Aquarium back in 1970. Therefore the species would be a contender for your second category.

With the exception of large marine animals like baleen whales, i still believe that every animal can be kept under human care. For many species there is still the problem, that we simply have to less knowledge to keep them alive right now. Other problems may be money or the source of animals, that aren't present at zoos yet. Quite a bunch of species kept nowadays where believed to be impossible to keep a few decades ago.
 
Maybe you should do some more research before starting a thread. Within two minute research at Zootierliste you could have found out, that a narwahl was kept for 4 months at Vancouver Aquarium back in 1970. Therefore the species would be a contender for your second category.

With the exception of large marine animals like baleen whales, i still believe that every animal can be kept under human care. For many species there is still the problem, that we simply have to less knowledge to keep them alive right now. Other problems may be money or the source of animals, that aren't present at zoos yet. Quite a bunch of species kept nowadays where believed to be impossible to keep a few decades ago.
@remar maybe the "no-no" category would include also months, but the general idea is that the animal will die under human care. I agree with you that most animals could theoretically be taken under human care, and would love that the thread could talk also about that!
 
Sorry for a double post, but zootierliste says that both SeaWorld SD (U.S) and Izu Mitu Sea Paradise (Japan) had in the past common minke whales! It says that the SeaWorld specimen died the day after the facility had rescued it. But the specimen at Izu Mitu Sea Paradise almost lasted a whole year, which is quite outstanding. The facility had the species in 1955, so I can imagine if the specimen would have lasted longer if the situation had occurred in the present day!
 
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