In 2015, the National Institutes of Health ended invasive biomedical research on its hundreds of chimps. Since then, it's been gradually moving the animals to a sanctuary in Louisiana called Chimp Haven. NPR science correspondent Nell Greenfieldboyce joins the show to talk about the NIH's effort to retire research chimps and why it's complicated.

Read more of Nell's reporting about chimp retirement:
https://n.pr/3HsgmLq, https://n.pr/3AW3smo and https://n.pr/3sbHyaV

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