Second Rejection of Long-Tailed Macaque Endangerment Listing by USFWS Sparks Debate

USFWS Denies Petition for Long-Tailed Macaque Endangerment

On July 14, 2026, the U.S. Fish and Wildlife Service (USFWS) once again turned down a request from activist groups, including People for the Ethical Treatment of Animals (PETA), to classify long-tailed macaque monkeys (Macaca fascicularis) as an endangered species under the Endangered Species Act (ESA). This marks the second time in three years that such a petition has been rejected by the USFWS.

The agency concluded that PETA's arguments lacked sufficient scientific substance to warrant further consideration. The rejection highlights the ongoing conflict between animal rights advocacy and scientific research, particularly in the biomedical field. Long-tailed macaques are integral to many areas of pre-clinical biomedical research due to their close physiological and genetic similarities to humans.

Matthew R. Bailey, the president of the National Association for Biomedical Research (NABR), expressed his support for the USFWS's decision. He praised the agency for conducting a thorough review grounded in scientific principles and for resisting pressures from activist groups aiming to manipulate environmental regulations to impede medical research.

Bailey noted, "It’s evident from the records that certain activist organizations are attempting to leverage the ESA to obstruct or complicate essential medical studies in both the U.S. and globally. Such actions not only pose risks to human health and well-being but also undermine the legitimacy of these environmental regulations when co-opted for political motives. It is our aim at NABR to ensure that decisions affecting species protection rely on the most accurate scientific evidence available."

Long-tailed macaques are widely utilized in biomedical research for various reasons. Their biological traits are similar to those of humans, making them valuable in studies that pave the way for advancements in areas such as regenerative medicine, immunology, cancer therapies, vaccine development, and pharmacology. The National Institutes of Health (NIH) has reinforced the significance of these primates by emphasizing their roles in biomedical discoveries through recent publications.

Bailey added, "Given their physiological closeness to humans, long-tailed macaques are indispensable in pre-clinical biomedical research. They facilitate the exploration of potential therapies before human clinical trials begin, supporting the safety and efficacy assessments of countless medications and treatments we rely on today."

Founded in 1979, the NABR is a nonprofit organization devoted to advocating for reasonable policies that ensure the humane use of animals in biomedical research, education, and testing. With a membership comprising more than 280 academic institutions, medical and veterinary schools, and industry stakeholders, NABR emphasizes the importance of responsible animal research in advancing both human and animal health.

This recent decision by the USFWS not only reinforces the role of science in regulatory decisions but also sparks a larger discourse about the balance between animal welfare and public health. As the debate over animal rights and biomedical research continues, the repercussions of these decisions will likely resonate throughout both communities.