Articles tagged with Monkeys
Capuchin monkeys turn to vertebrate prey during times of plant food scarcity, a pattern similar to human carnivory. Males hunt more often and prefer fat-dense tissues, suggesting a preference for brains and guts.
A study from Ohio State University found that sooty mangabey monkeys, with feet similar to those of humans, can climb vertical tree trunks with ease. The research suggests that the last common ancestor of humans and chimpanzees could have been a vertical climber, challenging existing theories about foot structure and forest environment...
The first complete marmoset genome is now available, providing a high-quality reference for studying complex diseases like Alzheimer's. The new genome reveals variation in genes linked to Alzheimer's disease, as well as immune system genes and previously un-catalogued ribosomal DNA genes.
In a new study, researchers found that wild capuchin monkeys prioritize stones with proven track records of cracking nuts, even if they're not the mechanically optimal choice. This demonstrates that primates rely on durable physical traces to guide their tool selection.
Researchers at Emory University developed an AI system, CapuchinAI, to automate cognitive studies of capuchin monkeys in the wild using facial recognition and real-time testing. The system identifies individual capuchins with 97% accuracy and provides a scalable field method for cognitive testing.
A new monkey species, Likweli, has been discovered in the Democratic Republic of Congo's Lomami National Park. The species, a rare and cryptic Colobus monkey, was identified through physical traits, genetics, and vocalizations.
A previously unknown species of African monkey, Colobus congoensis, has been identified in the Democratic Republic of Congo. The species, known locally as Likweli, features a distinctive orange face patch and is one of the rarest discoveries in modern primatology.
A recent study found that protecting primates in China's Yunnan province can also protect other animals and plants, highlighting the importance of umbrella species conservation. The research showed that large-bodied vertebrates need vast areas to support populations, which are habitats for many other species.
A study in Carlos Botelho State Park, Brazil found that brown howler monkeys rest more on hot, long days when feeding on leaves. The group traveled an average of 531 meters per day, influenced by interactions with other primate species like southern muriquis and capuchin monkeys.
Researchers at UCL found that some small-bodied primates experience a tight cephalopelvic fit during childbirth due to their large newborn heads. These species, such as American monkeys and bushbabies, have developed adaptations to make the process less difficult, including pelvic expansion or delayed pelvic bone fusion.
In a study on Japanese macaques, researchers found that semi-shade is an important thermoregulatory option under hot, dry conditions. The macaques preferred semi-shade over full shade or sun when it was hot and dry, but not humid. This suggests that semi-shade may play a significant role in helping endotherms cope with heat stress.
A team of researchers created a touchscreen-based game task inspired by hide-and-seek to elicit curiosity in resident Japanese macaques. The monkeys preferred moderate uncertainty, spending nearly 100 trials without rewards. This study supports the goldilocks principle, where animals seek moderately complex or uncertain stimuli.
A new study provides groundbreaking information about the social structures of primates, revealing that single-level societies are more like soccer leagues with exclusive teams competing for resources. Multi-level societies, on the other hand, resemble schools with students divided into classes but interacting regularly.
Researchers discovered that strokes cause a chain reaction within the brain, leading to neuronal cell death. They found that blocking collagen production can prevent this damage and even restore motor function in paralyzed monkeys. The new drug KDS12025 reduces hydrogen peroxide levels and prevents the entire process from being triggered.
In a unique behavior, monkeys on Gibraltar have learned to eat dirt to help them digest the junk food consumed by tourists, which disrupts their gut microbiome. The researchers found that geophagy is socially learned and has become part of the macaques' culture, with different troops having preferences for certain types of soil.
Researchers observed female baboons' vaginal tract altering sperm survival based on male genetic makeup, with strongest responses to genetically similar males. The study suggests post-copulatory mate selection via vaginal immune responses and pH in the baboon species.
Researchers have created genetically modified marmosets with a knocked-out OTOF gene, replicating key characteristics of human deafness. The animals developed normally but were deaf from birth, offering a crucial tool for developing new therapies.
Researchers found that larger amygdala volumes are associated with higher social tolerance in macaque monkeys, suggesting a multifunctional role of the amygdala in processing complex social information. Hippocampus volume was not significantly linked to social tolerance.
Research reveals that hunting pressure is shrinking safe space for mandrills in Equatorial Guinea's Monte Alén National Park. Mandrills are adapting to changing conditions by focusing on high-quality sites with limited human impact.
Researchers found that hot spring bathing in Japanese macaques subtly reshapes their relationships with parasites and gut microbes. The study suggests that behavior can shape the animal holobiont and act as an important driver of animal health.
Male bonobos focus their mating efforts on females who have reached maximum swelling and are older, indicating a higher probability of ovulation. This flexible strategy allows them to overcome the unreliable nature of female fertility signals.
A study by UCLA's Brian Wood and University of Michigan's John Mitani found a link between lethal aggression, territorial expansion, and improved reproductive success in wild chimpanzees. The Ngogo group's territory grew after coordinated attacks, leading to increased fertility and survival rates among females.
A year-long study on Japanese macaques found that their gut microbiome composition and fermentative ability adjust seasonally to improve digestive efficiency. The study reveals that mature leaf consumption boosts the fermentative ability of the gut microbiome, helping monkeys handle chemically defended foods during harsh winters.
Researchers observed 22 wild chimpanzees and found that their communication style was similar to that of their mother and maternal relatives, but not their father and paternal relatives. This suggests that chimpanzees may learn their communication behavior through social interaction with their mothers.
A new study has coined the term 'scrumping' to describe great apes' fondness for eating ripe, fermented fruit from the forest floor. The researchers suggest that this behavior may have played a significant role in the evolution of human alcohol tolerance.
Researchers explored neuroanatomy underlying social dominance in nonhuman primates, focusing on the uncinate fasciculus and its correlation with social dominance measures. The study found a significant correlation between this brain tract and social aggression, supporting human studies linking it to social dominance.
Long-tailed macaques in a new study showed preference for videos featuring aggression and familiar faces, similar to human behavior. The research, led by Elisabeth H.M. Sterck, found that lower-ranking and less aggressive monkeys paid more attention to videos, highlighting the importance of social information gathering.
Researchers from The University of Osaka found that Japanese macaques remain close to and care for their dying companions, displaying human-like reactions. The study reveals strong social bonds can affect behavior even after death, suggesting emotional capacities in non-human primates.
A large-scale database of macaque behavior is driving a shift towards open science, bringing together researchers from across the globe to share data on social lives of over 3,000 individual monkeys. The platform has grown into a collaborative effort promoting culture of sharing within the research community.
The Community Review Board voted unanimously to reject the merger, citing OHSU's history of federal Animal Welfare Act violations and unnecessary experiments on monkeys. The Physicians Committee for Responsible Medicine has been calling for the closure of OHSU's primate research facility, which houses over 5,000 monkeys.
Researchers discovered how monkeys produce 'voice breaks' and 'ultra-yodels' using their vocal membranes, which allow for a wider range of calls. These unique vocalizations enable monkeys to communicate in different ways, particularly in complex social lives.
Female Guinea baboons court males with special foraging skills more intensively due to the short-term benefits they provide. This suggests that females prioritize immediate rewards over long-term evaluations of male competence.
In a groundbreaking study, macaque monkeys demonstrated the ability to form connections between visual images and auditory signals, as well as verbal cues. This remarkable capacity for cross-modal learning was observed even when the spoken words were presented by new individuals.
A study on six Japanese macaques reveals that bodily responses like self-scratching predict pessimistic judgment bias, but not vice versa. This suggests an evolutionary conserved system where monkeys address immediate needs through bodily responses before engaging in cognitive information processing.
Researchers found that white-faced capuchin monkeys who showed a stronger stress response were more likely to survive extreme droughts. The study, led by UCLA's Susan Perry, used natural experiment of an El Niño drought in Costa Rica to investigate the adaptive nature of stress response.
Researchers at UCL conducted a study on wild Chacma baboons, finding they didn't recognize themselves in mirrors. The baboons showed curiosity with laser marks on visible body parts but not when the mark appeared in their mirror reflection. This strengthens evidence that monkeys do not recognize their own reflections.
Researchers found that capuchin monkeys in Brazil's Serra da Capivara National Park learn from each other's actions and that social tolerance is crucial for this process. The study showed that partners in collective activities, such as searching for parasites and playing games, are more likely to learn new skills from their companions.
Researchers found that monkeys swiftly identify snakes because of snake scales as a visual cue, revealing an evolutionary adaptation for threat detection. This insight into primate vision and brain evolution can improve our understanding of animal cognition.
A new method reveals a complete timetree of primates, including over 450 species, after aggregating untimed and timed phylogenies. This comprehensive tree represents the most complete description of primate evolution to date, enabling further research in fields like biogeography and conservation.
A new Harvard study finds humans possess higher metabolic rates than primates and apes, allowing for bigger brains, longer lifespan, and increased reproduction. Humans have 'escaped a tradeoff' between resting and active metabolism due to unique sweating ability.
A new study at Durham University found that social tolerance enables social learning in wild bearded capuchin monkeys, leading to the transmission of skills and traditions. The research showed that individuals with strong social tolerance were more likely to learn from others and share information about solving complex tasks.
A new study found that older macaques with smaller social networks suffer less from infectious disease. The research suggests a powerful reason for reduced social connections in aging animals, including humans.
Researchers have found that variability in when and how cells divide during embryo development leads to more optimal arrangements of cells, promoting robust tissue formation. This study challenges traditional views on the role of cell division variability in embryonic development.
Researchers discovered a cache of rare monkey fossils in the Dominican Republic, providing new insights into the anatomy and ecology of the extinct Antillothrix bernensis. The study suggests that male and female monkeys were monomorphic and weighed up to five pounds, with a diet mainly consisting of fruit.
Dartmouth anthropologists argue that jungle gyms and monkey bars are essential for childhood development, allowing children to build resilience and confidence through risk-taking play. The research cites fossil evidence showing early humans spent extensive time in trees, and modern nonhuman primates exhibit similar climbing skills.
A new study reveals that primate ornamentation plays a crucial role in communication between groups, reducing intergroup aggression. The research found that species with overlapping home ranges display more vibrant colors, which enable quick assessments of potential rivals.
A Dartmouth study suggests that social rank determines whether animals prioritize short-term energy consumption over long-term health, with dominant monkeys consuming food quickly to maintain dominance, while lower-ranked monkeys invest time in washing their food to prevent tooth damage. The findings shed light on the disposable soma h...
Research on macaque monkeys reveals that neurons in the frontal cortex respond differently to real and filmed partners during turn-taking exercises. This finding suggests that these neurons may be involved in spatial perspective-taking, a cognitive operation that enables individuals to mentally rotate themselves into others' positions.
A hurricane transformed a monkey society by changing the pros and cons of interacting with others. Macaques that displayed more social tolerance were 42% less likely to die than those that were less tolerant after Hurricane Maria. This shift in social behavior enabled them to access scarce shade, critical for survival.
A study in the Panamanian rainforest found that larger-brained primates did not outperform smaller-brained mammals in finding fruit. The research suggests that intelligence may not be directly linked to foraging efficiency, but could be related to other factors such as episodic memory or social complexity.
Male proboscis monkeys have larger nasal cavities than females, allowing them to emit louder calls to assert their status. The shape of the nasal cavity also influences the quality of these calls.
Researchers emphasize that field stations studying primates contribute to biodiversity conservation by deterring poaching, deforestation, and natural resource extraction. The authors call for increased funding and support for red colobus conservation efforts.
A Japanese research team from Shinshu University has successfully tested a novel approach to regenerative heart therapy using human induced pluripotent stem cells. The strategy involves injecting cardiac spheroids into damaged hearts, resulting in improved blood pumping capability and minimal arrhythmias in primate models.
Researchers used a new integrated wireless system to record brain activity in frontal areas of macaques' brains while they foraged. The results indicate that foraging strategies are based on a cortical model of reward dynamics.
Neuroscientists used wireless recording technology to investigate decision-making in rhesus monkeys foraging for food. The results show that monkeys learned to weigh time and past success when choosing between boxes, with longer wait times leading to more rewards.
Studies reveal how primates modify behaviors to care for themselves and others despite physical disabilities. Behavioral flexibility is crucial, allowing them to adjust species-typical behaviors and innovate new ways to participate in daily activities.
A recent study suggests that many nocturnal Strepsirrhines live in pairs of males and females, challenging the long-held assumption that these primates are solitary. Researchers found that pair-living was the most common social organization among ancestors 70 million years ago.
A new long-term study has found that vervet monkeys in neighboring groups have distinct social traditions, with some exhibiting more affiliative behaviors than others. The researchers observed that males adapted their social style to match their new group, suggesting a phenomenon akin to social conformity driven by peer pressure.
Researchers found that one group of vervet monkeys exhibited more affiliative behavior and reciprocated grooming, suggesting a social tradition. This discovery challenges the idea that ecological differences explain behavioral variations and highlights the importance of social influence in shaping primate cultures.
Researchers analyzed skeletal remains of ancient Egyptian baboon mummies from the site of Gabbanat el-Qurud, finding lesions and deformations indicative of malnutrition and lack of sunlight. The findings provide insights into how baboons were kept in captivity before their eventual mummification.