New Video Released to PETA Reveals Monkeys Injured, Driven Mad at Mass General Laboratory

For Immediate Release:
July 7, 2025

Contact:
Tasgola Bruner 202-483-7382

PETA today released never-before-seen video footage, provided by a Massachusetts General Hospital insider, exposing the harsh reality of the facility’s cruel experiments on primates.

The footage reveals monkeys confined to small, barren cages, engaging in self-mutilation due to severe psychological distress, and fitted with intrusive metal devices protruding from their bodies. Here are screenshots from the above video footage:

Experimenters at Mass General, a Harvard teaching hospital, cut out baboons’ organs and replaced them with organs taken from pigs, according to the insider. Other experimenters subject monkeys to invasive bone marrow and stem cell transplants or drill into monkeys’ skulls and implant electrodes into their brains for studies that have never produced any treatment for humans.

This is the latest example of video either taken by PETA investigators or given to PETA by insiders that reveals horrendous conditions for monkeys—yet all these facilities continue to rake in government funds. PETA urges all Americans to join our call for the closure of ALL monkey laboratories.

“No decent human being could see this video and think anything but ‘shut it down,’” says PETA Vice President Dr. Alka Chandna. “Conditions are just as bad at every monkey laboratory we’ve seen and they all need to be closed immediately.”

Mass General experiments on hundreds of monkeys who, in nature, live in structured social groups and can identify other monkeys by voice alone. The facility also uses pigs, dozens of rabbits, and thousands of mice and rats each year—and in 2024 alone, the facility received more than $300 million from the National Institutes of Health to fund these experiments.

PETA—whose motto reads, in part, that “animals are not ours to experiment on”—points out that Every Animal Is Someone and offers free Empathy Kits for people who need a lesson in kindness. For more information, please visit PETA.org or follow PETA on X, Facebook, or Instagram.