The big move follows Congress's 2013 reauthorization of the CHIMP Act, which called for the retirement of federally-owned chimpanzees used in labs. These 110 chimps originated from the New Iberia Research Center in Louisiana where they were subjected to medical testing.
"These animals were names on a spreadsheet," says Kathleen Conlee of the Humane Society.
"Where they came from they saw terrible things happen to each other on a daily basis. So seeing the chimpanzees look up to the sky without having bars over their heads, you can tell that they're relaxed and that they don't feel in danger."