Freedom at last! This is the moment a group of chimpanzees see daylight for the first time in 30 years - after being locked in cages for medical testing.
The animals hugged each other in delight before they took their first steps outside.
Emotional footage, below, shows how they reacted to their new surroundings.
The outing marked the end of a 14-year bid to re-integrate the 38 primates after they spent most of their lives cooped up inside.