Perhaps a little pack of 'Lazarus species' might be a compromise - animals that were either thought to have become extinct or were described from fossils before later being discovered to still be alive. There are a fair number of possible candidates:
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Bush dog: The bush dog was first described in 1842 from Pleistocene-era fossils found in a Brazilian cave. The following year the modern bush dog was discovered and named, although it wasn't until the 20th century that it was realised that the fossils and the living bush dogs were actually the same species. They are a unique-looking and highly sociable small canid from South and parts of Central America. Although they are very rare in American zoos (just 4 zoos keep them), they are among the most commonly-kept wild dogs in European zoos, with 47 places keeping them.
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Chacoan peccary: The genus of animals this South American peccary belongs to was described in 1930 as fossils but was later discovered to still be alive in 1974. They, quite uniquely among Planet Zoo's current South American species, are adapted to very arid conditions and live in cactus forests impenetrable to human explorers. They are quite common in North American zoos. They first arrived in Europe at Berlin Zoo in 2012 and since then they have been dispersed across ten European zoos.
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Takahe: A bit of a complex history to this flightless New Zealand bird. It was well-known and hunted by the Maori but the first specimens identified by Europeans were fossil bones in 1847. A live bird was then discovered in 1850. Four more birds were collected after that, the last in 1898, and the species was considered to be extinct again. It wasn't until 1948 that a small population was rediscovered again. Although they aren't kept anywhere outside of New Zealand, they are kept in a small number of zoos within the country itself.
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Edward's pheasant: For a long time, this colourful pheasant from Vietnam was considered to be extinct - there was a gap where no sightings were recorded between 1928 and 1988. There was then another gap with no sightings between 2000 and 2018. Fortunately, birds were able to be collected and taken into captivity and are now actually quite common in zoos - Zootierliste records 104 zoos across Europe and Singapore that keep them.
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Gray's monitor: This large monitor lizard from the Philippines was first discovered in 1845. It was then not seen again by scientists until the 1970s, some 130 years later. They are quite unlike either of the monitor lizards currently in the game - for starters it is primarily arboreal and rarely comes down to the ground. It is also almost unique in feeding primarily on fruit, unlike other, normally exclusively carnivorous monitor lizards. They are fairly well-represented in zoos in the United States, with much smaller numbers occurring in European zoos.
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Parma wallaby: Because it is the smallest of the wallabies, solitary and was never especially common, this species was thought to be extinct before the end of the 19th century. In 1965, workers attempting to control a plague of invasive wallabies in New Zealand discovered there were parma wallabies among their number - animals from this population were moved to institutions both in Australia and elsewhere in the world in the hope of breeding them successfully. Then, in 1967, the wallabies were found to have also survived unseen in New South Wales. Here in Europe, they are the second most commonly-kept species of wallaby in zoos.
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Black footed ferret: This North American mustelid was declared extinct in 1979, but a residual surviving population was found in 1981. They have been subject to a very successful captive breeding programme and now over a thousand individuals survive in the wild. In 2020, one of the original 1981 ferrets that never reproduced was successfully cloned. This species is kept in a number of zoos across North America.
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As for an exhibit animal, my personal choice would be the
Mallorcan midwife toad. They were first described from fossil remains in 1977 but was later discovered alive in 1979. There is a successful captive breeding programme for this species in European zoos, with nine zoos currently keeping them.
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