Reintroducing species it to take different species, mostly animals, that are raised or rehabilitated somewhere such as a zoo or conservation space, and release them back into their native habitats. They may be species that have suffered a severe population decline, may have been extirpated (extinct in one particular are but not overall as a species), or had some other circumstance that necessitated help in restarting populations. There has been reintroduction happening throughout the United States and the World for many years now. The pages here cover a few species but there are many more out there. For more information, please see the references below.