Three medical research baboons that briefly escaped captivity face a lifetime of invasive experiments, campaigners have claimed.
The male and two females escaped from their truck in a car park at Sydney's Royal Prince Alfred Hospital where the male was due for a vasectomy Tuesday afternoon.
They were safely captured by their handlers after a 90-minute standoff that was filmed by shocked bystanders.
Officials have confirmed the baboons are being used for animal testing for research into ailments such as kidney disease and diabetes.
Around 300 primates, including baboons, marmosets and macaques, are tested on each year in Australia, according to Humane Research Australia.
In 2016, gruesome reports emerged of experiments being performed on primates.
One baboon named Conan died after having a kidney from a genetically modified pig transplanted into him in 2014, according to Humane Research Australia.
The campaign group said two macaques and two marmosets have also died in brutal fashion due to medical experiments in the past four years.
One macaque was found in a barrel in a pool of blood and the other was found unable to move in its cage, the group said.
One marmoset died from a bleeding in her bowel in and the other after vomiting up clear foamy liquid, according to the campaign group.
There is no suggestion those animals have the same owner as the escaped baboons.
When the story about Conan was reported by the Sydney Morning Herald in 2016, officials said using baboons in experiments was saving human lives.
A spokeswoman for the Sydney Local Health District said: 'The colony has helped medical researchers conduct important research which has contributed significantly to paving the way for new treatments of disorders such as pre-eclampsia, complicated diabetes, kidney disorders and vascular diseases.'
On Tuesday evening Humane Research Australia demanded an