10/11/2025
PFAS found in mammals
We just don't realize the impacts our lifestyles are having on our wildlife.
Latest from CSIRO
Australia’s possums have highest PFAS levels in small mammals
November 3, 2025
Evrim Yazgin
News
Animals Biological Sciences Chemical Sciences Ecology
Scientists have shown for the first time that Australian marsupials are contaminated with “forever chemicals” which are known to cause significant health problems in other animals and humans.
PFAS, or per- and polyfluoroalkyl substances, are synthetic carbon-based molecules containing a lot of fluorine. They have been used in production of non-stick and heat-resistant materials, fire-fighting foams, waterproof clothing and cosmetics. And they are extremely difficult to break down.
The new study published in Science of the Total Environment journal reveals concentrations of PFAS in possums from the greater Melbourne area in Australia.
“All the possums we examined had been exposed to PFAS – we found 45 types of PFAS in their livers – and median levels were among the highest recorded in any small terrestrial mammal worldwide,” says lead researcher Ellis Mackay, a PhD candidate at the University of Melbourne.
“PFAS have been studied widely in aquatic animals, but we know very little about the health impacts of PFAS in terrestrial wildlife, and this is the first study to investigate PFAS levels in Australian marsupials,” Mackay adds.
“The possums in this study are sentinels warning us that broad PFAS contamination of Australian ecosystems and native species is highly probable.”
PFAS have been linked to serious health effects including cancer, developmental issues and immune system disruption.
“Globally, we are producing and using hundreds of thousands of synthetic chemicals including PFAS, with limited understanding of their long-term impacts,” says co-author Brad Clarke from the university’s Australian Laboratory for Emerging Contaminants.
“Building on this study, we are keen to investigate how different landscapes affect animals’ exposure to environmental contaminants, as well as examining the health impacts of exposure more closely.
“We are likely to see increasing health impacts from contamination of our ecosystems and food chains with synthetic chemicals, so tighter control of their production and use is essential.”