The animals have not been used as test subjects since 2015, when the NIH retired chimpanzees from invasive research.

The National Institutes of Health decided to relocate nearly two dozen retired research chimpanzees from a facility ... by animal advocates who have been fighting for years to get the animals ...

a move celebrated Friday by animal advocates who have been fighting for years to get the animals moved. NIH representatives confirmed in an email that the transfer of the 23 chimps from the ...