I understand that many animals, like water fowl for example have to be kept indoors for safty reasons, but I never understood why espically nocturnal/crepuscular animals like cats are not keept outside at night (if the climate and weather allow it, of corse). It would support the natural behavior of the animals, espically since they are undistrubed by visitors. But why is that for most species not done. Safety reasons is a terrible argument, since if they had the possibility to escape, they could do it not only at night, which obvious would be much worse. And for the safety of the animals makes no sense either, since these species are adapted to the night life, and would have no problem of preciving there surroundings. Why are animals like felines, canids, hyenas, many lemurs or bears in most facilites allways keept inside, in smaller enclosures at night ? It time they would be the most active. I need answers.