The monkeys were once involved in a US Food and Drug Administration study intended to investigate the role of various levels of nicotine in the onset of addiction in teens and young adults.

The monkeys were once involved in a US Food and Drug Administration study intended to investigate the role of various levels of nicotine in the onset of addiction in teens and young adults.

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Retired FDA research monkeys find new home and music in Florida

Squirrel monkey chirps filled a small ranch-style building in north Gainesville, Florida -- a chorus that made Kari Bagnall's smile swell even wider.