Articles tagged with Monkeys
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The study found that primate faces with more complex patterns are associated with larger group sizes and more closely related species in the same habitat. Facial complexity is linked to social communication among members of the same species, aiding identification and recognition.
Researchers found that South American squirrel monkeys can detect structural dependencies in musical patterns, similar to those found in human languages. This suggests that the ability to process dependencies may have evolved in human cognition along with human language.
Researchers found that rhesus macaque monkeys have specialized nerve cells in their brains that respond to images of snakes. This suggests that primates may have evolved to detect and avoid snakes due to the presence of venomous snakes during their ancestors' time.
Marmosets exhibit cooperative vocal exchange in a conversational manner, taking turns without interruptions, and follow unspoken rules of etiquette. This unique behavior is distinct from other animals and shares similarities with human communication patterns.
UCSF researchers have discovered a new adenovirus that can spread from primate to primate and potentially from monkeys to humans. The study suggests that adenoviruses may pose a risk for cross-species infections, highlighting the need for vigilance in tracking animal viruses.
The discovery of Archicebus achilles, a 55-million-year-old primate fossil, provides insights into the early evolution of humans and apes. The tiny skeleton, weighing around 20-30 grams as an adult, suggests that the earliest primates were small, day-dwelling tree-climbers.
The oldest known fossil primate skeleton, Archicebus achilles, was discovered in central China's Hubei Province. The 7-million-year-old skeleton is crucial in understanding the evolutionary divergence that led to modern monkeys, apes, and humans.
The discovery of Archicebus achilles represents a significant milestone in the field of paleoanthropology. Found to be approximately 7 million years old, this ancient primate fossil sheds light on the evolutionary divergence between the lineage leading to modern monkeys, apes and humans, and that leading to living tarsiers.
Fossil discoveries in Tanzania reveal the oldest evidence of the split between Old World monkeys and apes, dating back to 25 million years ago. The findings document two new primate species: Rukwapithecus fleaglei and Nsungwepithecus gunnelli.
Researchers observed 'striking' fickleness in male monkeys when copying the behaviour of others in new groups. The study provides rare experimental proof of cultural transmission in wild primates and sheds light on the evolution of human desire to seek out local knowledge.
Bearded capuchin monkeys deliberately place palm nuts in a stable position to crack them open, revealing their capacity for tactile strategy. The researchers found that the monkeys' tool-use skills improved with experience, as they learned to optimize the placement of the nut based on its shape.
A new study by the University of Pennsylvania has found that owl monkeys who stay with one partner produce 25% more offspring per decade than those who switch partners. This finding suggests that long-term monogamy and pair-bonding can improve reproductive fitness in certain individuals.
In endangered Mexican howler monkeys, habitat disturbance leads to increased 'travel time' foraging and high levels of stress hormones. Researchers found that fruit is a crucial component of their natural diet, and lack of fruit availability forces them to spend more time seeking out nutritious foliage.
A University of Michigan-led study found that individuals of mixed ancestry among hybrid howler monkeys are physically indistinguishable from pure individuals of each species. The findings suggest that the role of interbreeding in human evolution may have been underestimated due to limitations in the fossil record.
A study of long-tailed macaques found that males and females inhibit the sexual behavior of group members when bystanders are present, highlighting the importance of competition in shaping their dynamics. The researchers also discovered that sneaky copulations occur due to the exploitation of peripheral positions within the group.
Researchers at Emory University have identified grid cells in rhesus monkeys' brains, which fire in repeating triangular patterns as they explore visual scenes. This finding has implications for understanding how humans form mental maps of the world and may help explain why disorientation is a common symptom of Alzheimer's disease.
Researchers found a large number of previously undescribed viruses in the gastrointestinal tract of monkeys with SIV-induced AIDS, suggesting these viruses may contribute to disease progression. The presence of RNA viruses alongside DNA viruses offers new insights into the complex interplay between microorganisms and disease.
A new study published in PLOS ONE found that rhesus monkeys prefer a highly-valued food item alone to the same item paired with a lower-value item. This behavior is similar to what has been seen in human studies, where participants rated a highly-valued item more highly than one with multiple items of lesser value.
Researchers discovered that brown capuchin monkeys were more prosocial when given the opportunity to alternate and help each other, but not when tracking individual past choices. This suggests that reciprocity fosters generosity in humans as well, regardless of familiarity or group affiliation.
Researchers have successfully tested a vaccine against the deadly Nipah virus in monkeys, achieving a 75% fatality rate in humans. The vaccine, based on a protein from Hendra virus, has shown great efficacy in protecting animals from infection.
Two independent research reports published in PLOS ONE show that chimpanzees use weight to choose the best hammer for cracking open nuts, a sophisticated tool use. In contrast, old world monkeys modulate their begging behavior based on whether an experimenter is paying attention to them, suggesting intentional communication.
Researchers developed a new swab technique that can spot tuberculosis in non-human primates with no outward signs of disease. The method has been successfully tested on Asian monkey populations, revealing a significant prevalence rate and potential for primate-to-primate transmission.
Researchers analyzed fossilized primate skulls and CT scans of living primates to determine how extinct animals moved, focusing on the bony labyrinth of the inner ear. The study found that ancient primates were relatively agile, with some species moving faster than their Old World ancestors.
Brown capuchin monkeys demonstrate empathetic perspective-taking by withholding food from a fellow monkey who has just eaten, suggesting they understand their physical needs. The study provides first evidence for this behavior in primates.
A study of rhesus macaques found that their social status correlates with gene expression patterns across a range of genes, with lower-ranking individuals showing signs of chronic stress and altered immune function. The study estimates that gene expression can predict an individual's social status with 80% accuracy.
A systematic review of monkey studies found limited evidence for an association between social status and coronary artery disease. The study concludes that generalizing findings from monkeys to human societies is not warranted due to methodological limitations.
A team of scientists has confirmed the existence of Miller's Grizzled Langur, a rare and endangered monkey thought to be extinct. The species was found in a new geographic area of Wehea Forest in East Kalimantan, Borneo.
A new study reveals a 47-million-year-old primate, Notharctus tenebrosus, with a toe bone showing features of both nails and a grooming claw. This finding challenges previous classifications of primates and raises questions about the evolution of claws in our ancestors.
In a study published in the Proceedings of the National Academy of Sciences, researchers found that individual monkeys who avoid conflicts prevent large groups from achieving their competitive potential. By defecting, members of larger groups can gain an advantage when defending their territory but not when invading others.
In a groundbreaking study, monkeys trained at Duke University Center for Neuroengineering learned to control a virtual avatar hand and identify textures of virtual objects solely with their brain activity. This technology has the potential to restore tactile sensation and mobility to quadriplegic patients.
A novel virus has been identified that can infect both humans and New World monkeys, spreading between species. The titi monkey adenovirus (TMAdV) was found in a California primate research center and later infected a human researcher and a family member.
A novel virus spread through a California monkey colony in late 2009, infecting over a third of the monkeys and causing devastating respiratory illness. The virus also infected two human researchers and family members, demonstrating its ability to jump between species.
A study by cognitive psychologist Justin J. Couchman found that rhesus monkeys possess a form of self awareness, specifically the ability to understand they are the cause of certain actions. This sense of self-agency may help illuminate apparent self-awareness deficits in humans with autism, schizophrenia, and Alzheimer's disease.
A new study led by Yale researchers found that monkeys treat individuals from outside their groups with suspicion, similar to human behavior. The findings suggest that the roots of human intergroup conflict may be evolutionarily quite ancient, dating back at least 25 million years.
Researchers compared aging patterns of seven species of wild primates with humans, finding that human aging rates fall within the primate continuum. The study also confirms the mortality gap between males and females is narrowest for the least aggressive species.
A new multi-species comparison of primate aging patterns reveals that chimps, gorillas, and other primates grow old gracefully like humans. The study confirms a mortality gap between males and females, with males dying sooner than females in most species.
A new study of primate aging patterns reveals that humans are not unique in their aging process. By analyzing data from seven species of wild primates, researchers found that human mortality rates increase with age at a similar rate to other primates. The study also confirms the long-held pattern that males die sooner than females as t...
Researchers at University of Wisconsin-Madison have found rhesus macaques can recognize themselves in a mirror under specific conditions, contrary to previous assumptions. This discovery may refine the use of the mark test and challenge existing theories on self-awareness in primates.
Researchers found that environmental factors like temperature and light are equally important to the Azara's owl monkeys' natural rhythms as their internal biological clock. The study suggests that moonlight is a key adaptation for primates to exploit the nocturnal niche, with activity patterns changing in response to lunar cycles.
A new study has found that the antiviral gene TRIM5 plays a crucial role in suppressing the transmission of primate immunodeficiency viruses, including HIV-1 and HIV-2. The researchers used rhesus macaques with different versions of the TRIM5 gene to demonstrate its ability to block cross-species transmission of SIVs.
A recent discovery of a 29-million-year-old fossil catarrhine provides new insights into the facial anatomy of the ancestral stock of apes and Old World monkeys. The Saadanius skull supports the hypothesis that the last common ancestor had a baboon-like, long snout, similar to that of modern true apes and monkeys.
Researchers documented a wild cat species imitating the call of its intended victim, a small monkey known as a pied tamarin, to draw it within striking range. The behavior was confirmed through observations in the Amazonian forests of Brazil, providing insights into the psychological cunning of wild felids.
A study published in the journal Neuroscience found that regular aerobic exercise speeds learning and improves blood flow to the brain's motor cortex. Monkeys who exercised regularly performed better on cognitive tests than their sedentary counterparts, suggesting similar benefits for humans.
In a series of experiments, capuchin monkeys were given tokens to choose between their favorite food or a buffet of options. They consistently opted for the variety tokens, even when the favorite food was included in the assortment. This suggests that these animals have an innate desire to seek variety in their diet. The findings have ...
A study by Argentine scientists reveals that yellow fever outbreaks in howler monkey populations in northeastern Argentina have tragic conservation implications for the endangered brown howler monkey. The research emphasizes the importance of wildlife monitoring as an early detection method for pathogens affecting both animals and humans.
A newly analyzed 47-million-year-old Darwinius fossil was found to not be a human ancestor, contrary to previous claims. The fossil is now believed to be a forebearer of modern-day lemurs and lorises, according to two papers published in the Journal of Human Evolution.
Researchers analyzed global warming's impact on four New World monkey species, finding a significant drop in their populations during climate fluctuations. The team used statistical models to investigate how food resources and tree responses related to temperature and rainfall patterns.
New research suggests that some nonhuman animals, including dolphins and macaque monkeys, may possess functional parallels to humans' consciousness and cognitive self-awareness. These species exhibit behaviors such as hesitation and uncertainty, indicating a capacity for metacognition.
Researchers found that cotton-top tamarins responded to music with emotions such as anxiety and calmness, mirroring human responses. The study suggests that animals use musical elements to convey emotional content, similar to humans, and could have deep evolutionary roots.
A study found that capuchin monkeys prefer the company of researchers who imitate them, spending more time with their imitators. The monkeys also chose to engage in a task with their imitators over non-imitators, indicating a sense of affiliation.
A new monkey species, Mura's saddleback tamarin, has been discovered in the Amazon region of Brazil. The monkey is related to saddleback tamarins and faces threats from planned dams and highway construction.
A new fossil primate from Myanmar has redefined the origin of anthropoid primates, challenging the long-held belief that they evolved in Africa. The discovery of Ganlea megacanina supports the idea that amphipithecids are closely related to living anthropoids.
Rhesus monkeys demonstrate configural face perception, recognizing friends from foes based on facial feature layout. This ability has been conserved through primate cognitive evolution for 30 million years.
Researchers at Harvard University have demonstrated that individual monkeys within the same species exhibit varying levels of cognitive ability. A study published in PLoS One found that general intelligence, or 'g' factor, accounted for 20% of the variation in performance among cotton-top tamarins.
Researchers found that minor differences in cell proliferation timing can explain large differences in eyes of owl monkeys and capuchin monkeys. This discovery reveals an evolutionary mechanism for changes in brain structure, enabling flexibility in eye specialization.
Researchers found that wild spider monkeys regulate their daily protein intake similarly to humans, with a focus on maintaining a consistent level regardless of seasonal food availability. This pattern is linked to the development of obesity in humans and may have evolutionary origins dating back far older than previously thought.
Researchers discovered that only minor differences in cell proliferation timing explain the anatomical differences between owl and capuchin monkey eyes. This finding sheds light on how complex structures like the eye evolve gradually through evolution without compromising function.
Monkeys predominantly chose sharing tokens with relatives and familiar individuals, showing empathy-driven prosocial behavior. The study suggests that giving may be self-rewarding for monkeys due to social closeness.
The discovery of tiny fossilized teeth from India pushes the primate timeline back by almost 10 million years, revealing a new genus and species of anthropoid primates. The findings suggest these early primates lived on a fruit and insect diet and were no larger than modern dwarf lemurs.
A study has found that several people in South and Southeast Asian countries have been infected with simian foamy virus, a primate virus that has not been shown to cause human disease. Researchers tested about 300 people who live or work closely with monkeys and found eight participants positive for the virus.