There are several examples of this in other species. The Przewalski horse is probably one of the most dramatic examples. The population was reduced to around a

There are several examples of this in other species. The Przewalski horse is probably one of the most dramatic examples. The population was reduced to around a dozen individuals, all in captivity. After an intensive breeding and reintroduction program, the population is now around 2,000, with several hundred of those in the wild. There's also the Père David's deer. It's an interesting species: the only semi-aquatic deer species. It has webbing between its hooves and eats aquativ plants (along with grass). They were hunted essentially to extinction in their native territory in China, the only remaining individuals were a handful taken by missionaries (including Père David, their namesake). Today their population is over 8,000, with hundreds reintroduced to the wild. It's sad to think about, but it's also hopeful in a way. Humanity as a whole nearly killed these species, but a few dedicated individuals were able to save them.