Orangutan orphanages nurse animals back to health and release them into the wild, but that doesn’t seem to increase the population of these endangered apes
Source:
https://www.newscientist.com/article/2230529-releasing-rescued-orangutans-into-the-wild-doesnt-boost-populations/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home