What Happened
The long-tailed macaques, native to Southeast Asia, have been listed as endangered species on the IUCN Red List since 2022, due to a population decline of at least 50% over 30 years. However, the US Fish and Wildlife Service (FWS) has twice refused to consider protecting the species under the US Endangered Species Act. The latest decision was announced on July 14, 2026.
A listing would have restricted the importation of the primate for biomedical research, one of the greatest threats to its population. Mongabay requested a comment from FWS, but did not receive a response until publication.
Why It Matters
Long-tailed macaques (Macaca fascicularis) can live in a variety of habitats, from river margins and mangroves to tropical forests and cities. Despite their adaptability, populations of these medium-sized primates have declined drastically due to habitat loss, climate change, hunting, and trade, mainly for biomedical research, according to the IUCN, the global authority on wildlife conservation.
A 2025 study found that wild-caught macaques are likely supplementing breeding farms in Cambodia, Laos, and Vietnam that supply laboratories abroad. Lisa Jones-Engel, chief science advisor for primate experimentation at PETA, said that the capture of macaques for medical testing is the largest factor in the decline of their population.
The Mechanism/Science Behind It
Habitat loss and climate change affect the availability of food and shelter for long-tailed macaques, making them more vulnerable to hunting and trade. Additionally, the capture of macaques for biomedical research can have devastating effects on populations, as it removes reproductive individuals and destabilizes social groups.
The IUCN reports that the main threats to long-tailed macaques include habitat loss due to agricultural expansion, urbanization, and extraction of natural resources, as well as hunting for food and wildlife trade. Climate change may also affect the distribution and abundance of food, making macaques more vulnerable to starvation and dehydration.
Broader Context
The US decision not to protect long-tailed macaques is consistent with a broader trend of prioritizing the interests of the biomedical industry over wildlife conservation. The demand for primates for medical research is high, and many laboratories rely on the importation of wild animals to conduct experiments.
However, many experts argue that the capture of macaques in the wild is unnecessary and that alternative methods, such as captive breeding or computer simulation, can be more effective and ethical. Additionally, protecting long-tailed macaques may have broader benefits for biodiversity conservation and public health, as these animals play an important role in ecosystems and can be carriers of zoonotic diseases.
What Happens Next
The FWS decision may have significant implications for the conservation of long-tailed macaques and other primates. The continued capture of macaques in the wild for biomedical research may lead to further decline of populations and increase the risk of extinction.
It is essential that governments and international organizations take action to protect long-tailed macaques and other primates, promoting wildlife conservation and ethics in biomedical research. This may include implementing stricter laws and regulations to control the capture and trade of wild animals, as well as investing in alternative research methods that do not involve capturing animals in the wild.
Conclusion
The US decision not to protect long-tailed macaques is a reminder that wildlife conservation and ethics in biomedical research are complex and multifaceted issues. It is essential that governments, international organizations, and civil society work together to promote biodiversity conservation and public health, protecting long-tailed macaques and other primates from threats such as capture for biomedical research.
Source / Reference
Original URL: https://news.mongabay.com/short-article/2026/07/us-declines-to-protect-endangered-monkeys-used-in-medical-research/
Source: Mongabay