Animal rights activists confronted University of Massachusetts–Amherst (UMass) Chancellor Javier Reyes at the Kimpton Fitzroy London hotel over the school's menopause experiments on marmoset monkeys.

Footage shows the demonstration on February 8, as Javier stepped up to the microphone, only to be met with a wave of demonstrators wielding signs that read 'UMass: Stop Torturing Marmosets'.

Allegations against UMass include claims of researchers affixing electrodes to monkeys' skulls, inflicting neck incisions, water deprivation, prolonged periods of restraint, and other distressing actions aimed at studying menopause in marmosets, a species that reportedly does not naturally undergo menopause.

The experimenters further purportedly go to extreme lengths by surgically removing the animals' ovaries, administering hormone-altering drugs, and using hand warmers to induce symptoms resembling hot flashes – methods decried as inhumane and ethically questionable by protesters.

PETA Vice President Dr. Alka Chandna said: 'While Chancellor Reyes was enjoying himself at a swank London hotel, tiny monkeys with wires threaded through their bodies were suffering in cages.

'Reyes should shut down this shameful laboratory and embrace modern, animal-free research that's actually relevant to humans.'