From Brazil, I would import southern river otters and neotropical river otters. Endangered, popular, and currently Western zoos breed enormous number of only asian short-clawer otters.
Blond, Crested and Kaa'por Capuchins - endangered, with small range which will always make them in danger of extinction in the wild. And thriving in zoos.
Kaboman's or dwarf tapirs - again, tapirs are thriving in zoos.
Pity that many current conservationists seem to be stuck in the 1970s - they think zoos keep animals in small cages, and want to import them only to make money.
I also think there is little resemblance between thriving mostly domestic trade in pet animals in Brazil or elsewhere and one-time import of relatively few founder animals to modern zoos. Later will be strictly regulated, relatively small, and resulting animals would most likely breed so well that there will be too many of young for possible places to keep them. Good example are Bali starlings in zoos (very common and thriving) and in the wild (almost extinct, foreign zoos fund releases, but locals cannot protect the birds from being poached back).
From elsewhere in the world:
Weka and takahe from New Zealand - thrive in zoos, partially winter-hardy, charismatic and unusual.
From Australia, orange-bellied and ground parrots. It is a surprise for me why a bird so easy to breed in collections as a small Australian parrot is endangered with full extinction, instead of overrun with escaped cagebirds. Related princess parrot is beginners bird in Europe.
Also:
Pure-bred subspecies of Barbary sheep from North Africa. Common and thriving in zoos, endangered in the wild, and zoo stock is almost exclusively hybrid zoo-mix.
West African and Central African lions - again currently at the brink of extinction in the wild. In fact, being carelessly exterminated in their home range.
Pure-bred Malayan, Indochinese and Bengal tigers to the West. Again, common and thriving in zoos, endangered in the wild, with good reason to make safeguard population.
Four more otter species - spotted-necked, marine, smooth-coated and hairy nosed otters. Again endangered, popular and would find spaces.
Central American squirrel monkey - again, endangered species which would find holders.
Ethiopian wolf, Walia Ibex and Prince Ruspoli Turacos - three more species very easy to breed in zoos, which have tiny relict ranges in Ethiopia and will always be one step from extinction in the wild.
Bannerman's turaco from West Africa, several island pigeons from Melanesia and Polynesia, several island species of scops owls - yet more birds with extremely small ranges which would thrive in collections.
Blond, Crested and Kaa'por Capuchins - endangered, with small range which will always make them in danger of extinction in the wild. And thriving in zoos.
Kaboman's or dwarf tapirs - again, tapirs are thriving in zoos.
Pity that many current conservationists seem to be stuck in the 1970s - they think zoos keep animals in small cages, and want to import them only to make money.
I also think there is little resemblance between thriving mostly domestic trade in pet animals in Brazil or elsewhere and one-time import of relatively few founder animals to modern zoos. Later will be strictly regulated, relatively small, and resulting animals would most likely breed so well that there will be too many of young for possible places to keep them. Good example are Bali starlings in zoos (very common and thriving) and in the wild (almost extinct, foreign zoos fund releases, but locals cannot protect the birds from being poached back).
From elsewhere in the world:
Weka and takahe from New Zealand - thrive in zoos, partially winter-hardy, charismatic and unusual.
From Australia, orange-bellied and ground parrots. It is a surprise for me why a bird so easy to breed in collections as a small Australian parrot is endangered with full extinction, instead of overrun with escaped cagebirds. Related princess parrot is beginners bird in Europe.
Also:
Pure-bred subspecies of Barbary sheep from North Africa. Common and thriving in zoos, endangered in the wild, and zoo stock is almost exclusively hybrid zoo-mix.
West African and Central African lions - again currently at the brink of extinction in the wild. In fact, being carelessly exterminated in their home range.
Pure-bred Malayan, Indochinese and Bengal tigers to the West. Again, common and thriving in zoos, endangered in the wild, with good reason to make safeguard population.
Four more otter species - spotted-necked, marine, smooth-coated and hairy nosed otters. Again endangered, popular and would find spaces.
Central American squirrel monkey - again, endangered species which would find holders.
Ethiopian wolf, Walia Ibex and Prince Ruspoli Turacos - three more species very easy to breed in zoos, which have tiny relict ranges in Ethiopia and will always be one step from extinction in the wild.
Bannerman's turaco from West Africa, several island pigeons from Melanesia and Polynesia, several island species of scops owls - yet more birds with extremely small ranges which would thrive in collections.