In January the US government said it would release all but 50 chimpanzees used for research. Most of these chimps, some who are more than 50 years old, have never seen sunlight.
The animals will get a new lease on life at a national sanctuary in Louisiana called Chimp Haven.
The sanctuary now has more than 100 chimps in their care, who are free to climb trees, run around and groom each other in a five-acre playground.
Watching the freed chimps step outside for the first time after a lifetime behind bars is a reminder of just how human-like these animals are. You can actually see their jaws drop, which is pretty cute.
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