Declining primate numbers are threatening Brazil’s Atlantic forest

#Brazil’s Atlantic Forest, one of the most biodiverse ecosystems in the world, is facing severe threats due to deforestation and habitat fragmentation. This has led to a sharp decline in primate species, including the critically endangered southern and northern muriqui. The loss of these #primates, essential for seed dispersers in the Atlantic forest, is further destabilising the forest ecosystem. As human-driven deforestation escalates, the #extinction debt continues to rise, endangering both wildlife and the forest itself. You can take action to help their survival. Be #vegan for the animals and forests and #BoycottPalmOil #BoycottGold #Boycott4Wildlife.

#Deforestation for #mining #palmoil 🌴 soy and meat 🥩 in #Brazil’s Atlantic Forest 🌳 threatens #primates important to ecosystem seed dispersal like #muriquis 🐒 Resist and help them survive! Be #vegan #Boycottpalmoil #Boycott4Wildlife @palmoildetect https://wp.me/pcFhgU-8ZZ

#Primates like muriquis keep the #ecosystem in check in #Brazil’s Atlantic Forest yet #deforestation for #palmoil and #meat #agriculture threatens their survival. It must not happen! Fight for them #vegan, #Boycottpalmoil #Boycott4Wildlife @palmoildetect https://wp.me/pcFhgU-8ZZ

https://youtu.be/32XXgRqq7WQ?si=jZNJJ4t06N0dSsb6

Written by Juan Carlos Guix, Colaborador de la Facultat de Biologia, Universitat de Barcelona and Antoni Serra Sorribes, Director del Centre de Recursos de Biodiversitat Animal (CRBA) de la Facultat de Biologia, Universitat de Barcelona. This article is republished from The Conversation under a Creative Commons license. Read the original article.

Juan Carlos Guix, Universitat de Barcelona and Antoni Serra Sorribes, Universitat de Barcelona

We tend to think of debt as purely financial, but we can also reap what we sow in the natural world through what is known as extinction debt. This concept refers to changes in the past that affect a species’ survival in the future.

Ecosystems often undergo profound and dramatic changes, but their effects are not always obvious to the naked eye. These changes are increasingly caused or triggered by humans.

In many cases, affected species may not actually disappear for several decades or even centuries: individuals survive, but under ecological conditions that do not allow them to maintain genetically viable populations. This often occurs with plant and animal species that have long life cycles, such as certain tree species.

Some redwood or yew populations may therefore survive with the bare ecological minimum for long periods of time, but this does not mean that their existence is assured in the long-term future. This delayed result is the “debt” of extinction.

Such situations can occur in any ecosystem in the world, including tropical and subtropical forests. In fact, several studies have shown that biodiversity loss is accelerating on different continents, with the risk of mass extinction of species.

The primates of the Atlantic Forest

When we picture Brazil, it calls to mind the thriving Amazon rainforest, the mighty rivers of its vast basin and countless miles teeming with all manner of flora and fauna.

However, Brazil also hosts other landscapes which are just as unique as the Amazon. The Cerrado, Caatinga and the Mata Atlântica are just a few examples.

The Atlantic forests of South America – known as the Mata Atlântica in Brazil – are some of the richest and most diverse bioclimatic areas in the world, and are home to a large number of primate species. Many of these species are native to these forests and are in serious danger of extinction. This is the case, for example, for the southern muriqui (Brachyteles arachnoides) and the northern muriqui (Brachyteles hypoxanthus), two of the largest tree dwelling species of New World monkey.

Smaller endemic primate species such as tamarins (Leontopithecus rosalia, L. chrysopygus, L. chrysomelas and L. caissara) are also in danger of extinction. Others, such as guaribas, also known as brown howler monkeys (Alouatta guariba), which were relatively abundant until a few years ago, have been decimated by the recent outbreaks of yellow fever that have affected eastern and southern Brazil. All the primate species of the Atlantic Forest have in common the fact that they survive in isolated forest fragments of varied dimensions, surrounded by crops and pastures.

Consequences for trees

Many of the interactions that occur between animals that feed on fruits and the plants that produce them are considered “mutualistic interactions”, a type of ecological relationship that benefits individuals belonging to two or more species. In these cases, the plants produce the fleshy, nutritious pulp of the fruits that is consumed by the animals. In return, many of their seeds are distributed in places where new plants can germinate and grow.

Human impacts often affect the interactions between animals – such as tree dwelling primates – and plants. Recently, it has been found that these impacts often result in extinction debts affecting numerous tree species.

Trees that produce seeds that are large or protected by a very tough shell rely heavily on such animals to disperse their seeds effectively through the forest. Therefore, when large primates and other herbivorous vertebrates become locally, regionally or globally extinct, the plants whose seeds they disperse are also affected.

A recent study attests to this. The research shows how deforestation, habitat fragmentation and disease have affected the primates of the Atlantic Forest in southeastern and southern Brazil, and how the ecological interactions in which they participate or used to participate have changed.

This study warns that the progressive deterioration of the interlinking mutualistic interactions between animals and the plants on which they feed is jeopardising the very survival of these forests.

This threat comes on top of climate change which will, in the short term, cause forest fires to become more frequent. In the middle and long term, it will turn vast areas of forest into open savannahs little suited to the needs of tree dwelling primates. Forest fragmentation – whereby forest areas are isolated from each other and surrounded by intensive sugar cane or soybean cultivation – will only exacerbate these effects.

Written by Juan Carlos Guix, Colaborador de la Facultat de Biologia, Universitat de Barcelona and Antoni Serra Sorribes, Director del Centre de Recursos de Biodiversitat Animal (CRBA) de la Facultat de Biologia, Universitat de Barcelona. This article is republished from The Conversation under a Creative Commons license. Read the original article.

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A 2019 World Health Organisation (WHO) report into the palm oil industry and RSPO finds extensive greenwashing of palm oil deforestation and the murder of endangered animals (i.e. biodiversity loss)

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#Agriculture #animalBehaviour #AnimalBiodiversityNews #animalCommunication #animalCruelty #animalExtinction #animalIntelligence #animalRights #biodiversity #Boycott4wildlife #BoycottGold #BoycottPalmOil #Brazil #deforestation #ecosystem #extinction #meat #meatAndSoyDeforestationInBrazil #mining #monkey #monkeys #muriquis #NorthernMuriquiBrachytelesHypoxanthus #PalmOil #palmOilDeforestation #palmoil #Primate #primates #tamarin #Tamarins #vegan

Bridging the Gap: Connecting Critical Habitat for Golden Lion #Tamarins in Brazil https://www.rainforesttrust.org/our-impact/rainforest-news/bridging-the-gap-connecting-critical-habitat-for-golden-lion-tamarins-in-brazil/

"About 60 miles south of #RioDeJaneiro, one of the last globally important populations of Endangered Golden Lion #Tamarin exists in 13 small, isolated fragments of lowland #AtlanticForest... Protection of this property has allowed for reforestation of the forest canopy, bridging the gap, and giving the tamarins the best possible chance of survival."

Pied Tamarin Saguinus bicolor

Pied Tamarin Saguinus bicolor

Critically endangered

Brazil

The Pied Tamarin lives in primary forests and in small fragments of secondary forests. In primary forests like Reserva Ducke the density is lower than in small fragments (Gordo 2012). They eat fruits, nectar, plants and animal prey (including frogs, lizards, eggs, small birds, spiders and insects). They live in extended family groups of four to 15 individuals. They are critically endangered from palm oil, soy, meat and gold mining deforestation throughout their range. Help them every time you shop and #BoycottGold4Yanomami, #Boycottpalmoil #boycott4wildlife

Pied #Tamarins are critically #endangered, threats incl. massive #deforestation in #Brazil 🇧🇷 for #palmoil 🌴🙊⛔️#beef 🐮🥩⛔️ and gold. Help them to survive #Boycottpalmoil #Boycott4Wildlife #BoycottGold! @palmoildetect https://palmoildetectives.com/2021/02/20/pied-tamarin-saguinus-bicolor/

Pied #tamarins are unique matriarchal #monkeys of #Brazil, led by 1 female in small troops 🐒🩷 #Gold #palmoil #soy and #meat #deforestation are decimating them. Fight for them and #Boycottpalmoil 🌴🚫 #BoycottGold 🥇🚫#Boycott4Wildlife @palmoildetect https://palmoildetectives.com/2021/02/20/pied-tamarin-saguinus-bicolor/

The principal threats to the Pied Tamarin include deforestation and habitat fragmentation related to expanding rural settlements and agriculture, livestock production, urban development, an expanding energy matrix and road network, all within this species’ concentrated range in the vicinity of Manaus, the state capital of Amazonas.

IUCN Red List

Name, IUCN Status, and Locations

Pied Tamarin Saguinus bicolor
Red List: Critically Endangered
Locations: Brazil – restricted to the forests surrounding Manaus in Amazonas, north of the Rio Amazonas and east of the Rio Negro.

Mist rises over the fragmented forests around Manaus, where the Pied Tamarin clings to survival in one of the smallest and most threatened ranges of any primate on Earth.

Pied #Tamarins are fascinating and vibrant black-faced #monkeys with a shock of white fur around their muzzle and chest and expressive brown eyes. They are found only in the shrinking forests of Manaus, #Brazil. As bulldozers carve roads and cities sprawl, their home is being destroyed for #palmoil, #soy, #beef farming, #gold #mining, and relentless urban expansion. These tamarins also face threats from disease, predators, and the illegal pet trade. Use your wallet as a weapon and BoycottPalmOil, Boycott4Wildlife, BoycottGold4Yanomami, and be #Vegan to help their survival.

Appearance and Behaviour

Pied Tamarins are instantly recognisable, with their hairless black faces, large “bat-like” ears, and fluffy white bodies contrasting with dark brown hindquarters and tails. Males and females look alike, measuring 20–28 cm in body length with tails up to 42 cm, and weighing around 400–450 g. Their hands and feet end in sharp claws, not nails, perfect for gripping branches and extracting gum from trees. Groups range from 2 to 15, led by a dominant female who is the only breeder. Their society is matriarchal and highly cooperative—males and siblings help care for the young, carrying twins through the canopy. Pied Tamarins are avid communicators, using a rich repertoire of chirps, trills, and even ultra-quiet “tsê” signals, some so soft that only spectrograms reveal them. They scent-mark their territory and use long calls to warn rivals or find lost group members. Curious and clever, they navigate a world of danger—dodging power lines, dogs, cats, and the ever-present threat of capture.

Threats

Deforestation and habitat fragmentation

The Pied Tamarin’s forest home is disappearing fast as Manaus expands. Palm oil, soy, beef, and gold mining drive relentless forest clearing, leaving only tiny, isolated patches. Urban sprawl and pollution make survival harder, and even protected areas are shrinking. Food is scarce in these fragments, and social groups of pied tamarins are split apart. With over 80% of their range set to vanish in less than two decades, extinction in the wild is a real risk.

Infrastructure projects and roads

New roads and power lines slice through the remaining forests, forcing Pied Tamarins to cross dangerous open spaces. Many are killed by vehicles or electrocuted on wires. Construction brings more people, noise, and pollution, making the forest even less safe. These projects also open the door for more logging and poaching, speeding up the loss of habitat.

Illegal pet trade and human persecution

Pied Tamarins are captured for the illegal pet trade, with infants sold in markets and many dying from stress. The pet trade tears apart family groups and leaves survivors vulnerable. Some tamarins are also hunted or killed as pests, and wildlife protection laws are poorly enforced. Every animal taken from the wild pushes the population lower.

Competition with golden-handed tamarins

Golden-handed tamarins are moving into Pied Tamarin territory and outcompeting them for food and space. These rivals thrive in disturbed habitats, pushing Pied Tamarins into smaller, less suitable fragments.

Predation by domestic dogs and cats

Wild cats, birds of prey, and snakes hunt Pied Tamarins, but domestic dogs and cats are now major threats in urban areas. With less forest cover, tamarins are easier targets. Every attack can break up a group and make survivors more cautious and isolated.

Disease

Pied Tamarins are highly vulnerable to a range of diseases, especially in fragmented habitats near cities. They can contract toxoplasmosis from stray cats and rodents, which can be fatal and has caused outbreaks in captive tamarins. Callitrichid hepatitis, caused by lymphocytic choriomeningitis virus (LCMV), is another serious threat, leading to sudden deaths in both wild and captive populations. Chronic diarrhoea and weight loss, often linked to marmoset wasting syndrome (MWS), are common in captive groups and associated with changes in gut bacteria, including overgrowth of Helicobacter and Lactobacillus species. Pied Tamarins also face risks from colitis and septic infections like tularemia, as well as general vulnerability to new pathogens introduced by domestic animals and humans.

Diet

Pied Tamarins are omnivores, feasting on fruits, nectar, flowers, plant gums, insects, spiders, frogs, lizards, bird eggs, and even small birds. Their sharp claws and teeth are perfect for gouging tree bark to extract gum, a crucial food in the dry season. By eating a wide variety of foods, they help disperse seeds and control insect populations, playing a vital role in the forest ecosystem. In captivity, they are sensitive to diet changes, and breeding success is linked to proper nutrition.

Reproduction and Mating

Pied Tamarins live in female-led groups, with only the dominant female breeding. She releases pheromones that suppress the fertility of other females. Mating is polyandrous—the dominant female mates with several males, and usually gives birth to twins after a gestation of about five months. The whole group helps raise the young, with males and siblings carrying infants and returning them to the mother to nurse. Breeding occurs mainly from March to May, but can happen year-round. In the wild, lifespan is uncertain but likely less than 10 years due to constant threats; in captivity, some live over a decade.

Geographic Range

The Pied Tamarin’s range is one of the smallest of any primate, limited to the forests around Manaus, north of the Rio Amazonas and east of the Rio Negro. Surveys show they rarely occur more than 35 km from Manaus, and are now absent from much of their former range due to deforestation and competition with golden-handed tamarins. Their last strongholds are small, degraded forest patches, some less than 10 hectares, surrounded by roads, suburbs, and farmland. Even in protected areas like Adolfo Ducke Forest Reserve and Sumaúma State Park, their numbers are falling as the city expands.

FAQs

What is the current population of the Pied Tamarin?

The Pied Tamarin population is estimated at fewer than 500 mature individuals in the wild, with a projected decline of over 80% within the next 18 years. Most groups survive in tiny, degraded fragments, often below the threshold needed for long-term survival. Captive populations exist, but breeding is challenging and does not offset wild losses. The National Action Plan aims to secure at least eight viable populations, each with at least 500 individuals, but this goal remains distant. Without urgent, large-scale habitat protection, extinction in the wild is a real risk.

How long do Pied Tamarins live?

In the wild, Pied Tamarins likely live less than 10 years due to predation, disease, and urban hazards. In captivity, some individuals survive over a decade, but stress and poor diet can shorten their lives. Females can breed from about two years old, but only the dominant female in each group reproduces. The high infant mortality rate in fragmented habitats further reduces average lifespan. Captive breeding programmes have had limited success, with many infants failing to survive. The constant threat of electrocution, road kills, and attacks by dogs or cats makes wild survival especially precarious.

What are the threats to the Pied Tamarin’s survival?

Pied Tamarins face a perfect storm of threats: rampant deforestation for palm oil, soy, beef, and gold mining; relentless urban expansion; direct competition from golden-handed tamarins; and daily dangers from dogs, cats, disease, and electrocution. The illegal pet trade rips infants from their families and fuels further decline. Fragmented habitats mean less food, fewer safe nesting sites, and higher stress. Even protected areas are under pressure as Manaus grows. Climate change and environmental instability only add to their vulnerability. Every threat is magnified by their tiny, shrinking range.

Does the Pied Tamarin make a good pet?

No absolutely NOT. Pied Tamarins are highly social, sensitive primates who suffer extreme stress, loneliness, and early death in captivity. The illegal pet trade destroys family groups, causes immense suffering, and drives the species closer to extinction. Captive tamarins often develop health and behavioural problems, and most do not survive long. Removing tamarins from the wild for pets is illegal and unethical, and fuels the ongoing decline of the species. The best way to help is to support indigenous-led protection of their habitat and refuse to buy wild animals as pets.

What can you do to help the Pied Tamarin?

You can make a difference by boycotting palm oil, soy, and beef products linked to Amazon deforestation. Refuse to buy gold mined from the Amazon, and never support the illegal pet trade. Support indigenous-led conservation and agroecology projects that protect and restore the forests around Manaus. Share the story of the Pied Tamarin to raise awareness and pressure governments to enforce habitat protections. Advocate for urban wildlife corridors and safe crossings to reduce road kills and electrocutions. Every action you take helps keep the forests alive for the Pied Tamarin and countless other species.

Take Action!

The Pied Tamarin is Critically Endangered with a projected population reduction of 80% or more in the next 18 years (three generations) due to grave multiple threats. Deforestation and habitat fragmentation related to expanding rural settlements and soy, palm oil and meat agriculture, urban development, an expanding energy matrix and road network and routine collection for the pet trade.
Help them to survive and every time you shop andBoycottPalmOil. Boycott4Wildlife. BoycottGold4Yanomami.

Support the conservation of this species

Merazonia wildlife rescue and sanctuary rehabilitate tamarins and marmosets some of the most trafficked animals in the world. Donate to them here

Durrell Foundation

Action for the Wild

Further Information

Barr, S. (2016). Conservation efforts for pied tamarins Saguinus bicolor. Lund University. https://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=8518535&fileOId=8518603

Gordo, M., Jerusalinsky, L., Mittermeier, R.A., Rohe, F., Boubli, J., Subirá, R. & Vidal, M. 2019. Saguinus bicolor. The IUCN Red List of Threatened Species 2019: e.T40644A17931870. https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T40644A17931870.en. Downloaded on 16 February 2021.

Lagroteria, D., Cavalcante, T., Zuquim, G., Röhe, F., Medeiros, A. S. M., Hrbek, T., & Gordo, M. (2024). Assessing the invasive potential of Saguinus midas in the extent of occurrence of the critically endangered Saguinus bicolor. Frontiers in Conservation Science, 5, Article 1426488. https://doi.org/10.3389/fcosc.2024.1426488

Mercado, J. A., Curro, T. G., Armstrong, D. L., & Duhamel, G. E. (2005). Colitis in captive tamarins. American Association of Zoo Veterinarians, Joint Annual Conference. https://nagonline.net/wp-content/uploads/2014/03/Mercado-COLITIS-IN-CAPTIVE-TAMARINS.pdf

Ramsay, E. C., Montali, R. J., Worley, M., Stephensen, C. B., & Holmes, K. V. (1989). Callitrichid hepatitis: Epizootiology of a fatal hepatitis in zoo tamarins and marmosets. Journal of Zoo and Wildlife Medicine, 20(2), 178-183. https://repository.si.edu/bitstream/handle/10088/959/Ramsay_1989.pdf

Wikipedia. (n.d.). Pied tamarin. In Wikipedia. Retrieved June 13, 2025, from https://en.wikipedia.org/wiki/Pied_tamarin

Pied Tamarin Agustin bicolor

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2. Contribute stories: Academics, conservationists, scientists, indigenous rights advocates and animal rights advocates working to expose the corruption of the palm oil industry or to save animals can contribute stories to the website.

Wildlife Artist Juanchi Pérez

Read more

Mel Lumby: Dedicated Devotee to Borneo’s Living Beings

Read more

Anthropologist and Author Dr Sophie Chao

Read more

Health Physician Dr Evan Allen

Read more

The World’s Most Loved Cup: A Social, Ethical & Environmental History of Coffee by Aviary Doert

Read more

How do we stop the world’s ecosystems from going into a death spiral? A #SteadyState Economy

Read more

3. Supermarket sleuthing: Next time you’re in the supermarket, take photos of products containing palm oil. Share these to social media along with the hashtags to call out the greenwashing and ecocide of the brands who use palm oil. You can also take photos of palm oil free products and congratulate brands when they go palm oil free.

https://twitter.com/CuriousApe4/status/1526136783557529600?s=20

https://twitter.com/PhillDixon1/status/1749010345555788144?s=20

https://twitter.com/mugabe139/status/1678027567977078784?s=20

4. Take to the streets: Get in touch with Palm Oil Detectives to find out more.

5. Donate: Make a one-off or monthly donation to Palm Oil Detectives as a way of saying thank you and to help pay for ongoing running costs of the website and social media campaigns. Donate here

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