Florida — June 1, 2026 — Scientists are turning to insects that feed on blood, waste, and carcasses to unlock hidden biodiversity. These creatures, from mosquitoes to dung beetles, carry fragments of animal DNA in their guts, offering researchers a powerful tool to detect elusive species and even track pathogens.
Entomologist Lawrence Reeves of the University of Florida has shown how mosquito blood meals can reveal the presence of rattlesnakes, cotton rats, toads, and tortoises without ever spotting them directly. This growing field, known as invertebrate‑derived DNA (iDNA), is revolutionizing biodiversity monitoring by using insects as “natural samplers.”
Studies in the Peruvian Amazon found that dung beetle iDNA contained traces of 42 vertebrate species, including primates and predators like pumas. Similarly, leech iDNA in China’s Ailaoshan Nature Reserve mapped endangered frogs and Asiatic black bears, proving the method’s accuracy in assessing conservation efforts.
Beyond biodiversity, iDNA is helping track wildlife diseases. Researchers in Côte d’Ivoire used carrion flies to map sylvatic anthrax in monkeys and squirrels, while Reeves is scanning mosquito blood for viruses in pigs and turkeys. These insights could reveal hidden reservoirs of pathogens and their spread in ecosystems where humans and wildlife interact.
While challenges remain — such as extracting degraded DNA and preventing contamination — advances in sampling and lab techniques are making iDNA more efficient than traditional monitoring methods. As wildlife geneticist Torrey Rodgers notes, “It’s almost a partnership” between scientists and the insects that unknowingly collect genetic clues.
By harnessing these tiny field assistants, researchers hope to illuminate the unseen lives of countless species and strengthen conservation and disease surveillance worldwide.
