Ready to retire?
A nascent movement to send aging research monkeys to sanctuaries divides the biomedical community. </br>!</img> Bush, a cynomolgus macaque, was a research monkey at Princeton University for nearly 20 years. PHOTO: DAVID KELLY CROW It's been a long road to retirement for Bush the monkey—and not just because he's spent the past 15 hours in the back of a van motoring red-eye from New Jersey to Indiana. For nearly his entire life, the 23-year-old macaque lived in a lab at Princeton University. There, researchers conducted MRI scans on him to understand which parts of the brain perceive faces, and he spent much of his time in an indoor cage. In 2017, with Bush suffering from arthritis and nearing the end of his life span, the lab decided to send him to a sanctuary. “We had a very deep emotional relationship with Bush,” says Sabine Kastner, a Princeton neuroscientist who oversaw studies on the monkey. “We were all very sad the day he left, but we were happy for him.” The unive