A zoo in the United Kingdom has become an unlikely laboratory for a technique that sounds like science fiction: pulling the DNA of animals out of nothing but air. Researchers in Denmark and the UK have shown that airborne genetic material, shed by animals into their surroundings, can be collected and sequenced to reveal which species are present. The method could transform how scientists monitor ecosystems, detect invasive species, and spot pathogens before they cause outbreaks.
At a UK zoo, scientists vacuumed the air and found hidden animals
At Hamerton Zoo Park in Cambridgeshire, researchers set up air samplers near enclosures and in open spaces. They used filters to capture particles from the air, then extracted DNA from those samples. The results were striking. The team detected 25 species of mammals and birds, including animals that were not visible from the sampling locations. They picked up DNA from tigers, lemurs, and even the endangered Eurasian eagle owl. The method worked even when the animals were indoors or behind barriers. The air itself carried enough genetic information to identify them.
From zoo enclosures to forests and hospitals
The same approach is being tested far beyond zoo walls. In Denmark, scientists have used airborne DNA to monitor biodiversity in forests and grasslands. They have detected insects, amphibians, and mammals without ever seeing them. In one study, researchers identified 49 species of vertebrates from air samples collected in a single forest. The technique is also being explored for human health. Hospitals in the UK and elsewhere are testing air samplers to detect airborne pathogens such as tuberculosis bacteria and viruses. The goal is to identify infectious agents before people show symptoms, giving public health officials a head start.
Local ecologists and conservationists care because this method could solve a persistent problem: many animals are hard to spot. Traditional surveys rely on cameras, traps, or human observers, all of which miss shy or nocturnal species. Airborne DNA sampling requires no direct contact with animals and can cover large areas quickly. It also reduces stress on wildlife. For invasive species, early detection is critical. In the UK, the technique has already picked up DNA from the Asian hornet, an invasive predator of honeybees. Finding it early could mean the difference between containment and an uncontrolled spread.
This work builds on a decade of advances in environmental DNA, or eDNA, which scientists have previously extracted from water and soil. Air is the newest frontier. The technology is still young. Researchers are working to distinguish DNA that comes from living animals from DNA that has been dead for days or weeks. They are also refining the equipment to make it portable and affordable. But the potential is clear. A simple air pump, a filter, and a lab sequencer can now reveal the hidden presence of life all around us, whether in a zoo, a forest, or a hospital ward.
