In 2011, the Gut Aiderbichl animal rescue organization in Austria rescued several chimpanzees which had been caged in an indoor laboratory for up to 30 years. Some, having been born there, had never seen the outside world.
Gut Aiderbichl prepared an open air environment for the chimpanzees, then moved them to a cage adjoining it. When it was ready, they opened a door between the two. The curious chimpanzees began to explore a bright new world. It’s not the wilderness to which they can never return, but it is a better life. You can follow their progress here.
-via Lost at E Minor