Articles tagged with Nonhuman Primates
A new study using genetic links reveals that chimpanzee populations traded advanced toolsets across generations, demonstrating a cumulative culture. Female migrations played a key role in spreading innovation, with complex tools built upon simpler versions.
A study published in PLOS Biology found that great apes and adult humans alternate attention between two subjects when observing an event, similar to human language's agent-patient relationship. This suggests that the way brains order events evolved before language.
A study of 57 adult chimpanzees found that social play before group activities like hunting or territorial defense increased collaboration and cooperation. Play also helped to relieve tension and resolve conflicts, suggesting its role in maintaining cohesive societies.
Researchers found chimpanzees of all ages displayed contagion of grooming and playful behaviors, with younger chimps more susceptible to play contagion. This behavioral contagion may help strengthen social bonds by reinforcing friendly behaviors.
A new review highlights the differences in brain aging and Alzheimer's disease between humans and non-human primates, revealing that primate brains are more resistant to aging-related damage. The study suggests that tau tangles play a critical role in Alzheimer's progression, challenging the amyloid cascade hypothesis.
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.
Researchers found that chimpanzees complete more difficult tasks when watched by multiple people, while performing worse on easier ones. This 'audience effect' suggests a unique bond between chimps and humans, influencing task performance.
Researchers are using deep learning to help protect chimpanzees in the Greater Mahale Ecosystem, Tanzania. A new acoustic detector has been developed to identify chimpanzee sounds and monitor population density more efficiently, allowing for better conservation strategies.
Ecologists argue that ethanol is naturally present in nearly every ecosystem and likely consumed by most fruit- and nectar-eating animals. This consumption could carry benefits for wild animals, such as a source of calories and potential medicinal benefits.
Scientists at UC Davis have identified new clusters of cells with differing gene expression patterns in the human and non-human primate amygdala. These findings suggest that alterations in specific cell types may contribute to disorders such as anxiety, and could lead to more targeted treatments.
A new study by University of Technology Sydney researchers challenges the Infinite Monkey Theorem, finding it unlikely a monkey can type out Shakespeare's works before the universe ends. With around a 5% chance, even an increased number of monkeys would not produce the Bard's entire works.
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.
Fossils from over 600,000 years ago show a shift in animal communities between warm and cold climate fluctuations. The Notarchirico site provides evidence of the emergence and disappearance of species such as cave lions, straight-tusked elephants, and red deer.
Researchers developed a new algorithm to decode neural signals representing hand postures, enabling more precise control of neuroprostheses. The study, conducted on rhesus monkeys, shows that posture-related activity in the primate grasping circuit is crucial for accurate control.
A genetics study suggests that bonobos have three distinct populations, each with unique genetic patterns. The research highlights the need for conservation efforts to protect these groups and ensure the species' survival.
A recent study published in PNAS found that Japanese macaques do not experience maternal mortality during childbirth despite having a similar pelvis-to-head ratio to humans. The researchers believe that the flexibility of their pelvic girdle and birth dynamics may be key factors contributing to this lack of risk.
A new study reveals that bais, vast treeless clearings in the Congo Basin, are home to numerous endangered species, including Western lowland gorillas and African forest elephants. The researchers found over 2,000 distinct bais, covering less than 0.2% of the national park's landscape.
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.
Four plants eaten by western lowland gorillas in Gabon, also used by local traditional healers, show antibacterial and antioxidant properties. Researchers identify four plant species with promising targets for treating multidrug-resistant infections.
A recent study published in PLOS ONE found that bonobos, known for their nonviolence, show a moderated version of the common enemy effect when faced with threats from other groups. The researchers suggest that this behavior may have emerged several million years ago, before human and chimpanzee lineages diverged.
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.
Researchers found that lemurs integrate sensory information with ecological and social knowledge to locate hidden fruit. The animals' ability to remember the location of the fruit weeks later demonstrates their complex cognitive abilities.
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...
Researchers have identified a universal blueprint for mammalian brain shape, describing the cerebral cortex as following a fractal pattern across species. The study suggests that cortices across primate species resemble this universal scaling law and self-similarity, revealing a common set of mechanisms governing cortical folding.
Researchers found that chimpanzees' gestures follow a rapid-fire pattern of turns, similar to human conversations, with short pauses between gestures at around 120 milliseconds. This suggests shared underlying rules in communication and may indicate that human language is not unique.
Researchers have developed a new nonhuman primate model that allows for the tracking and treatment of early-stage Alzheimer's disease. The study shows a six-month window in which disease progression can be measured, enabling preclinical testing of interventions targeting the tau protein.
Chimpanzees have been observed seeking out specific plants with medicinal properties to treat their ailments, and further pharmacological testing has confirmed the presence of anti-inflammatory and antibiotic compounds. These findings highlight the importance of studying animal behavior in discovering new medicines.
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 team of researchers from Japan has successfully developed a noninvasive method to measure heart rates in chimpanzees using millimeter-wave radar technology. The technique involves emitting high-frequency electromagnetic pulses at the chest of the animal, capturing echoes, and analyzing subtle body movements to estimate heart rate. Th...
Researchers compared human hearts with those of great apes, discovering a more compact muscle structure in humans, related to greater cardiac function. This finding supports the hypothesis that human heart evolved to meet higher demands of human physiology, such as larger brain size and physical activity.
Researchers have generated complete 'end-to-end' reference genomes for the sex chromosomes of five great ape species, highlighting enormous variation on the Y chromosome. The findings inform understanding of diseases related to genes on these chromosomes in both apes and humans.
The study reveals remarkable variation between primate Y chromosomes, showing rapid evolution and previously unstudied regions. The researchers found that over 90% of ape X chromosome sequences aligned to the human X chromosome, while only 14-27% of ape Y chromosome sequences aligned to the human Y chromosome.
A University at Buffalo-led research team has found that the same genes whose mutations gave rise to a low functioning male gorilla reproductive system may also be responsible for human male infertility. Researchers identified 109 reproductive-related gorilla genes that are often mutated when present in infertile men.
Researchers will use high-resolution scans and data analysis to investigate the influence of genes and environment on tooth morphology in two primate species. The study aims to advance bioanthropological practice and provide a comprehensive understanding of dental genetic architecture.
A study found that adult chimpanzees continue to learn and refine their tool-using skills well into adulthood, suggesting a prolonged learning capacity is key to the evolution of complex tool use in chimps and humans. Chimpanzees developed motor skills for handling sticks by age six, but continued to hone techniques until age 15.
A new study by University of Colorado Boulder primatologist Michelle Sauther found that smaller animals like the lesser galago face extra challenges adapting to climate change. The research highlights the importance of protecting these small and nocturnal species, which are often overlooked in conservation efforts.
Researchers discovered lemurs possess an additional pair of vocal folds, which they believe is responsible for enriching their vocal repertoire and allowing them to exaggerate their size. This adaptation may have provided a selective advantage in competition for territory or mates.
Researchers at German Primate Center investigated how rhesus monkeys encode target positions in arm movements, finding that brain areas can switch between body- and object-related spatial reference systems depending on the task. This flexible coding is essential for developing neuroprostheses that can interpret brain signals correctly.
A new Harvard study reveals that male bonobos engage in more acts of aggression than chimpanzees, contrary to their peaceful reputation. The researchers found that bonobos exhibit less sexual coercion and violence towards females, but more frequent 'squabbling' among males.
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.
Researchers observed a rare instance of lemur predation by a fosa in the Betampona Strict Nature Reserve. The impact of this predation, combined with low reproductive rates and genetic isolation, poses significant threats to the survival of critically endangered lemurs.
Researchers found that male bonobos were more frequently aggressive than chimpanzees, engaging in 2.8 times more interactions and 3 times as many physical aggressions. More aggressive males had greater mating success, challenging the self-domesticating hypothesis.
A recent study reveals that the demand for critical minerals in Africa is putting African Great Apes at risk due to deforestation and habitat destruction. The study estimates that more than 180,000 gorillas, bonobos, and chimpanzees are at risk, with West African countries like Guinea being the most severely affected.
Researchers sequenced RNA transcripts from 18 primate brains to map every expressed gene, revealing remarkable variation in humans and chimps compared to other primates. The study identifies specific genes for further research and sheds light on human neurodegenerative disorders.
Researchers at Kobe University identified differences in synaptic protein production between mice and marmosets during development. The study found that these differences may relate to evolutionary differences between rodent and primate brains, as well as their relevance to autism spectrum disorders.
Researchers studied female Assamese macaques for eight years, finding that social networks decrease with age due to physical limitations and a desire to protect themselves from predators. The study's findings shed light on the biological roots of social aging in humans.
A study predicts African great apes will experience more wildfires and flooding due to climate change. Temperatures are projected to increase at all sites, with frequent heatwaves and crop failures anticipated under a 2°C warming scenario.
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 study published in Nature tracked neural activity of freely moving macaques using wireless eye tracking and neural monitoring. The research found that the visual cortex plays an active role in social behavior by providing signals to the prefrontal cortex, enabling the decision to cooperate.
A study published in the International Journal of Primatology confirms living Skywalker gibbons in Myanmar, leading to estimates of up to 65,000 individuals in one area. The conservation committee aims to protect this new population and promote protected areas for the species.
Great apes engage in playful teasing behaviors, including provocative actions and one-sided provocation, similar to human infant teasing. This study suggests that the cognitive prerequisites for humor evolved in the human lineage at least 13 million years ago.
Children from diverse cultures can anticipate food choices made by others based on their preferences, a uniquely human trait. In contrast, non-human great apes lack this ability, suggesting a cross-cultural robustness of childhood theory of mind in humans.
Social network analysis of sanctuary-living Grauer's gorillas reveals adult females are central to the group's dynamics and most gregarious. This study provides unique insights into the behavior of a critically endangered species and informs on their care and future release strategies.
New evidence reveals that giant ape species 'Gigantopithcus blacki' went extinct between 295,000 and 215,000 years ago due to its inability to adapt to changing climates and food preferences. The study used multiple dating techniques and environmental analysis to confirm the extinction timeline.
Research reveals that prolonged exposure to plantations during infancy triples the likelihood of infant mortality. Exposure to pesticides and agricultural chemicals may negatively affect infant development and lead to increased mortality rates.
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 discovered that humans can differentiate between primate vocalizations based on acoustic similarity to human speech. The study suggests that the human brain processes primate calls more efficiently when they are closer in frequency to human language, not just phylogenetically close.
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 found that great apes and chimpanzees can recognize groupmates they haven't seen in over two decades, suggesting a shared common ancestor and potentially the longest-lasting nonhuman memory. The study uses infrared eye-tracking cameras to record participants' gazes at images of familiar and stranger bonobos or chimps.
Scientists at Niigata University successfully produced marmoset eggs and embryos from xenotransplanted ovaries, offering a new method for generating genetically modified marmosets. The novel egg production system is expected to facilitate research into human diseases and contribute to regenerative medicine.