Didn't a zoo in the US, I think Bronx, keep Binturong, Short-clawed Otters and Prevost's Tree Squirrels together?
I know Brookfield Zoo, Chicago, has had an exhibit in the Fragile Kingdom building with these species together for several years.
Brookfield has always been rather pioneering in their mixed species exhibit and continues to have several, including those in Habitat Africa, Australia House, and Tropic World . The last time I was at Tropic World , their South American hall mixed Brazilian lowland tapir, giant anteaters, king vultures, 2 species of spider monkeys, squirrel monkeys, tufted capuchins, and other bird species as well in one impressive indoor exhibit. Tropic World Africa had a pygmy hippo, mandrill , guerza, sooty and red capped mangabeys , and talapoin monkeys together - I know they don't have the talapoins now though.
Another interesting exhibit is at Seattle's Woodland Park Zoo(which has several mixed species displays throughout the zoo ) in the Nocturnal House where you will see douroucouli, tamandua, prehensile tailed porcupines, and 3 banded armadillos ( hutias were once there as well ) in a series of interconnected exhibit spaces.
Omaha's Henry Doorly Zoo has several spectacular mixed species exhibits as well , unfortunately I can't remember all the species mixed together because it's been a few years, but I am going to see family nearby in 2 weeks so I will check it out then, and take some pictures as well.
Eric
Portland, Oregon