The American Society of Primatologists (ASP) is hosting its 2026 Conference in Arlington, Virginia, from June 17–20, 2026, with the theme Looking at the Past, the Present and the Future: What Is to Come for Primatology? It is a special year, as the ASP has recently endorsed the International Primatological Society (IPS) policy statement about plastic pollution and its impacts on primates: the first-ever research policy statement of its kind and an important development in primatological research.
Plastic Pollution Coalition Co-Founder and Chief Vision Officer Dianna Cohen was among the experts who helped shape that statement, and will be part of a special roundtable session on plastic pollution and primates at the upcoming conference. During the session, Cohen will give attendees a background illuminating the full problem of plastic pollution, such as the fact that 99% of plastic is made from fossil fuels, and that plastic poisons primates—including people—and all living things. She will shed light on microplastics and plastic chemicals, and their presence in air, food, soils, water, and our bodies—discussing how plastics and chemicals in plastics affect the health and hormones of men, women and children. Cohen will dive into how plastic contributes to the climate crisis, and disproportionately harms rural, low-income, Black, Indigenous, and People of Color communities on plastic’s industrial frontlines/fencelines. Perhaps most importantly, she’ll address solutions, including new policies that can help curb plastic pollution; reducing plastic use in businesses, food and beverage packaging, and schools; and using litigation as a tool for change.
Why Are Primates Particularly Vulnerable?

Plastic Pollution Coalition Scientific Advisor Janette Wallis, Ph.D., has been sounding the alarm on plastic harming nonhuman primates for years. In 2015, she published a guest blog documenting a troubling pattern she’d witnessed across primate field sites: plastic everywhere, and curious primates picking it up, playing with it, and putting it in their mouths.
In January 2025, Wallis co-authored a major overview with primatologist and conservationist Evelyn D. Anca, detailing the problem: microplastics are increasingly found in the guts of monkeys and macaques, plastic-borne pathogens are threatening the health of species that can catch many of the same diseases we do, and forests are being left polluted.
Plastic pollution reaches the deepest depths of oceans and even unfolds deep in tropical forests, in the hands and mouths of primates. Nonhuman primates are among the most endangered groups of large mammals on Earth, with over 90% of their species’ populations in decline. They are also increasingly victims of the plastic pollution we leave behind.
What makes primates uniquely vulnerable is, ironically, their intelligence. With their manual dexterity and curiosity, primates tend to pick up and explore the plastic they find, often manipulating it in an attempt to find food, exposing themselves to microplastics, toxic chemicals, and the pathogens plastic surfaces can harbor.
Since primates disperse seeds and regenerate forests, their health is the forest’s health. And the forest’s health is ours.
But there’s hopeful news on this front, as the IPS International Primatological Society) and ASP have formally taken up the Plastic Pollution Policy Statement that Dr. Wallis and Evelyn Anca drafted together, with help from Dianna Cohen, bringing it to official approval after years of work. In parallel, the IUCN (International Union for Conservation of Nature and Natural Resources) Primate Specialist Group’s Section on Human-Primate Interactions officially formed a working group on plastics, which Wallis and Anca co-chair.
Plastic Pollution Coalition (PPC) and primatologists—like Dr. Wallis and Evelyn Anca, and the other presenters at this year’s ASP Conference—have been building the case that plastic pollution adversely affects our forests and primates. Attendees at the upcoming ASP Conference will learn more about this issue from some of the foremost experts working to address plastic pollution.
Participants in the special session will include:
Colin Chapman, Ph.D., is a Biologist and Biological Anthropologist at Vancouver Island University who has been doing primate field research in Africa for decades, focused in and around Kibale National Park in Uganda. He studies the roles that disease, nutrition, stress, and climate change play in determining primate abundance, while also exploring how to best conserve the world’s biodiversity. One of his recent interests is plastic pollution. Chapman is an advisor to Maria Fernanda Alvarez Velazquez, a student studying the relationship between howler monkeys and plastic pollution in Mexico, and has developed a community education component to her work.
Janette Wallis, Ph.D., is a Primatologist whose primary interest is chimpanzees, baboons, and other African primates and led the APS/IPS policy statement on plastic pollution and primates. She is a Scientific Advisor for Plastic Pollution Coalition and the Executive Director of the Kasokwa-Kityedo Forest Project in Uganda, where her research focuses on behavioral ecology of chimpanzees and the various effects of forest fragmentation. She also has an ongoing interest in the topics of primate conservation, disease transmission, and tourism. At this year’s APS Conference, 10 years after the first session held on the topic at the ASP/IPS Conference in 2016, she will provide a brief overview of the history of the topic of plastic pollution as it relates to primates and growing interest in this topic from fellow primatologists.
Dianna Cohen, is the Co-Founder & Chief Vision Officer of Plastic Pollution Coalition, a non-profit communications and advocacy organization that collaborates with an expansive global alliance of organizations, businesses, and individuals to create a more just, equitable, regenerative world free of plastic pollution and its toxic impacts. A Los Angeles based visual artist, Dianna has shown her work internationally at galleries, foundations, and museums. She uses plastic in her artwork to make a visual and social impact. With plastic bags as her primary material for more than 30 years, Dianna is interested in exploring its materiality through modifications and the material’s relationship to culture, media, toxicity, and the world at large and shared this in her 2010 TED talk “Tough Truths About Plastic Pollution.” Dianna studied Biology, Art, and Film at the University of California, Los Angeles and holds a BA in Fine Arts.
Virtual participants will include:
Evelyn D. Anca, is a conservationist and a primatologist focusing on plastic pollution, the human–-wildlife interface, wildlife trade, and Indigenous knowledge; CEO of Plastic Free Israel; and conservation artist. She will join the conference virtually from the UK where she has recently started a graduate program at Durham University, and share her relevant work on the topic of plastic pollution and primates, including her research, plastic pollution advocacy work, and conservation art. Anca was also instrumental in the IPS/ASP policy statement and is working on an International Union for the Conservation of Nature document regarding best practices around plastic pollution for field primatologists.
Anamélia de Sousa Jesus, Ph.D., a primatologist studying plastic pollution and primates. She recently published a study on the first evidence of microplastic ingestion in an arboreal primate—howler monkeys—in Brazil. While many primatologists have assumed that it’s mostly terrestrial primates that are exposed to plastics, de Sousa Jesus has found even those spending most of their time in trees can be exposed. She will join virtually to discuss her work.
Mariella Siña, is a PhD student who has been studying the presence of microplastics in various terrestrial mammals in Hong Kong, including macaques as well as some non-primate species (boar, buffalo, cattle, and porcupine). She will join virtually to share her research.
Sabrina Kreif, D.V.M., is a professor and researcher studying primates, mostly chimpanzees, in Uganda. She will join the conference virtually to share exciting new research on plastic pollution and its impact on Ugandan primates.










