Articles tagged with Monkeys
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 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 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 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.
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.
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 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.
Researchers found that chimpanzees extract termites from mounds most successfully when rainfall increases, until a threshold of 200mm is reached. This suggests that termite fishing is a seasonal activity for chimpanzees, with the best opportunities during the early wet season.
Researchers in China have reported the groundbreaking achievement of creating a live birth of a chimeric monkey using embryonic stem cell lines. The study demonstrates the ability of these cells to differentiate into various tissues in vivo, opening up new possibilities for genetic engineering and species conservation. Analysis reveale...
New research finds that pied tamarins increase scent marking in response to urban noise pollution, which affects their vocal communication. This adaptation may help them cope with the impact of human activity on their habitat.
A study by Dartmouth researchers reveals that human shoulders and elbows evolved to facilitate 'downclimbing' - the process of descending from trees without dying. This adaptation allowed early humans to navigate their environment safely, gathering food and deploying tools for hunting and defense.
A vaccine originally developed to prevent bacteria-caused diarrhea has been found to also help infant nonhuman primates grow faster, according to a new study. The researchers found that vaccinated baby monkeys were taller than the unvaccinated when measured from head to toe, with a significant improvement in growth rate.
New research finds masturbation serves an adaptive function in primates, increasing reproductive success and aiding pathogen avoidance. The study, based on nearly 400 sources, reveals masturbation's evolutionary history and its co-evolution with multi-male mating systems.
The study reveals new insights into primate evolution, genetic diversity, and the uniqueness of humans. It also highlights the importance of preserving primate species due to high genetic diversity, which enables adaptation to changing environments.
Researchers observe 'social motor entrainment' in macaques, where movements synchronize with others, and find it varies by animal pairs, social hierarchy, and stimulus type. This study provides insights into the neural underpinnings of social cohesion and has implications for understanding human conditions like autism spectrum disorder.
Researchers from Oregon Health & Science University have discovered how stem cell transplantation can kill the virus that causes AIDS. The study, published in the journal Immunity, reveals that two circumstances must co-exist for a cure to occur and documents the order in which HIV is cleared from the body.
A new database reveals thousands of incidents of primates killed by vehicles on roads over the past 30 years, with most species not at risk but some Endangered and Critically Endangered primates involved. Conservationists urge effective mitigation measures to protect wildlife navigating fragmented habitats.
Researchers discovered that a certain short-wave or blue sensitive cone circuit is absent in marmosets and differs from the macaque monkey's circuit. This finding suggests that humans have unique neural wiring for color vision that may be linked to recent evolutionary adaptations.
A groundbreaking study published in Nature Neuroscience shows that monkeys can think deeply about problems, consider multiple factors, and find optimal outcomes. This discovery challenges traditional views on animal intelligence and highlights the complexity of monkey cognition.
A team of investigators created embryo-like structures from monkey embryonic stem cells and transferred them into female monkeys, which implanted and elicited a hormonal response similar to pregnancy. The study provides new tools and perspectives for exploring primate embryos and reproductive medical health.
A study found that monkeys with opposable thumbs were fooled by a sleight-of-hand trick, while those without were not. The French drop trick worked for capuchins and squirrel monkeys due to mirroring in their neural motor system.
Researchers found that humans achieve dynamic balance by taking turns, while monkeys use static strategies that often result in one player losing out over time. Monkeys can learn to coordinate dynamically with human partners but then compete with each other.
A new study of rhesus macaques found that older female macaques have fewer friends, reducing their ability to transmit knowledge outside their social circles. This decline in cohesion and connection has significant consequences for network structure, potentially affecting information transmission and cooperation.
A new nonhuman primate model of Usher syndrome has been confirmed, providing hope for the development of a treatment for this leading cause of blindness-deafness. The model, created using CRISPR/Cas9 technology, exhibits symptoms similar to those experienced by humans with the condition.