Articles tagged with Primates
A genetic census has been used to estimate the number and population structure of critically endangered western chimpanzees in West Africa. The analysis identified a total of 136 chimpanzees living in four different communities, with high levels of shared ancestry and genetic diversity.
Fossils of two near-primate species, Ignacius mckennai and I. dawsonae, dating back 52 million years have been discovered on Ellesmere Island in layers linked with the early Eocene epoch. The findings suggest that these Arctic-dwelling primates evolved more robust teeth and jaws to cope with tougher food sources during winter months.
Fossilized mammals reveal that early primates adapted to life in the high Arctic during a time of intense global warming, with limited biodiversity. Two new species, Ignacius dawsonae and Ignacius mckennai, were identified as close relatives of early primates, exhibiting distinct adaptations for their unusual environment.
Research suggests that the ratio of adult females to males influences sex roles in animal species. Variation in this ratio can lead to differences in mate competition, parental care, and social behavior among species. The study proposes that understanding these dynamics can inform conservation efforts.
Researchers discovered that wild chimpanzees exhibit facial similarities with their family members, especially as they age. The study found that adult chimpanzees were the easiest to match, while younger infants and males were more challenging, suggesting different pressures on biological family resemblance in these species.
A new study reveals that losing endangered fruit-eating animals in the Atlantic Forest could severely disrupt seed-dispersal networks, leaving plants without an effective means to regenerate. Nearly 55% of specialist plant species rely solely on these frugivores for seed dispersal.
Researchers mapped the spread of pathogens in wild macaque populations near human settlements, finding that monkeys with high human interactions cause larger outbreaks. The study used computer simulations to predict disease transmission and identified key factors influencing outbreak size.
Western gorillas in zoos have developed a novel vocalization to get attention and food from their human caregivers. Researchers observed this unique behavior in response to food availability and interaction with zoo staff.
Researchers found that Gursky's spectral tarsier duets exhibit acoustic trade-offs in note rate and bandwidth, suggesting a relationship between physical fitness and vocal complexity. The study suggests that only physically fit individuals can easily produce broadband notes fast.
Researchers found that specific vocalizations, known as the 'hunting bark', recruit more group members to hunt and capture prey more effectively. Chimpanzees have been observed joining hunts after hearing these barks, increasing success rates.
Newborn marmosets practice face and mouth movements needed to call for help before birth. Human-like crying movements have been observed in the womb, suggesting a potential link between primate and human vocal development.
Researchers develop system to measure power distribution between sexes in animals, finding females rule in some species, with reproductive control as common thread. The study proposes a new framework to quantify intersexual power relationships across mammalian societies.
Vervet monkeys have excellent cognitive skills for quickly appraising social context and planning routes accordingly. They make complex, multifactor decisions that consider contextual information, such as individual skill, rank, and competitor distance.
Researchers have discovered that P. malariae, a malaria parasite infecting humans, originated in African apes before evolving to infect people. This breakthrough reveals the evolutionary links between the two species and sheds light on how the parasite adapted to infect humans.
Research found that adult howler monkey play increases when faced with competition over fruit, a valuable resource. This playful behavior helps regulate relationships within the social group and avoid conflict, unlike collective grooming used by some other primates.
Research shows female chimpanzees tend to avoid villages and farmland, while males are more likely to encounter humans, leading to smaller social gatherings for females. This sex difference in risk perception could have significant consequences for the survival of chimpanzees.
In a study published in PLOS ONE, researchers found that untrained captive orangutans can complete two major steps in making and using stone tools: striking rocks together and cutting using sharp stones. This suggests that the use of stone tools may have existed in our last common ancestor with orangutans 13 million years ago.
A study published in PLOS ONE found that younger people are more interested in owning exotic pets, such as pythons, than older generations. The research suggests a growing trend towards unusual pet ownership among younger populations.
Researchers found that wild chimpanzees do not independently invent complex tool use behaviors like nut cracking. Instead, they learn from observing and imitating others, similar to humans. This challenges the long-held assumption that chimpanzee culture is non-cumulative.
A new study has shed light on the gut microbiome of gorillas, revealing significant diversity among individuals and institutions. The research found that even healthy gorillas can have unique microbial profiles, emphasizing the importance of understanding individual context for health assessment.
Research using ring-tailed lemurs shows that fecal microbiota transplants can stabilize and restore a healthy gut microbiome after antibiotic use. The study confirms the effectiveness of this ancient treatment for reducing the negative effects of antibiotics on the gut, which can cause severe diarrhea and abdominal pain.
A new study found that female bushbabies experience sharper increases in glucocorticoid hormones than males, indicating they may be under more stress and have less wiggle room to survive in a changing environment.
Researchers found that both male and female Guinea baboons initiate group departures and are equally successful in leading the group. The study's findings challenge the common assumption that only males lead groups, suggesting that social organization alone does not determine leadership roles.
Researchers at North Carolina State University developed formulas to calculate primate body size based on tooth root surface area. This discovery can be applied to partial and incomplete fossils, allowing scientists to determine the diet of ancient primates.
African mammals suffered huge losses around the Eocene-Oligocene boundary, similar to those experienced by European and Asian species. The study used fossil data from multiple sites in Africa to build evolutionary trees for five mammal groups, revealing a drastic extinction event followed by recovery with new adaptations.
A study published in Scientific Reports discovered dental caries in prehistoric primates, indicating a high fruit diet or sugar-rich foods. The prevalence of caries fluctuated over time, suggesting changes in the primates' diet between sugary and non-sugary foods.
A study published in iScience found that apes purposefully use signals to start and end interactions, similar to human politeness. The researchers observed that the social dynamics between interacting apes affected the communication efforts used, with closer bonobo pairs showing shorter entry and exit phases.
A study by Duke University researchers found antibiotic-resistant bacteria in the guts of lemurs living close to humans. The closer the contact, the more resistant bugs were found. Proximity to humans determined the type and abundance of resistance genes acquired.
Researchers have sequenced the nuclear genome of the koala lemur, a giant primate that went extinct in Madagascar around 500-2,000 years ago. The findings reveal new insights into its position on the primate family tree and how it interacted with its environment, which could help understand past lemur extinctions.
A new study by WCS found that 53% of households in the area had eaten lemur meat over the past year, highlighting the need for conservation efforts to reduce hunting and consumption of these protected species. The study aims to assess the impact of ongoing conservation initiatives and promote alternative protein sources.
A new study reveals that sifakas, a genus of lemurs found only in Madagascar's forests, have taste preferences and digestive adaptations that allow them to thrive on tough leaves, fruit, and even pine needles. This dietary flexibility may give them an advantage over their strictly leaf-eating or fruit-only cousins.
Researchers found that ring-tailed lemurs can detect ripe cantaloupe from a distance of up to 56 feet using their sense of smell. The study demonstrates the first time primates track distant smells carried by wind.
Duke Lemur Center successfully replicates wild hibernation conditions, revealing insights into metabolic disorders and aging. The study's findings have significant implications for human health, particularly in the development of new treatments for heart attacks and strokes.
A new mouse lemur species, Microcebus jonahi, has been identified in northeastern Madagascar with a divergent lineage and smallest primate size. The discovery emphasizes the urgent need to address deforestation and habitat loss threatening Madagascar's unique biodiversity.
A recent study by Sandra Heldstab and colleagues found that primate species follow fixed neural development patterns when learning fine motor skills. Humans develop their abilities later than other primate species due to the less developed state of our larger brains at birth.
Researchers identified three compounds responsible for the sweet scent, which increased females' attraction during breeding season. The findings suggest that these compounds act as pheromones, potentially influencing mating success.
Researchers have found that Madagascar's forest cats are domestic cats from the Arabian Sea region, potentially introduced hundreds of years ago via trade ships. This discovery raises concerns about the impact on native species and ecosystems, particularly the fossa, a forest predator facing extinction.
A recent study highlights the urgent need for reforestation and conservation efforts to protect Madagascar's unique lemur species, with over 95% threatened with extinction. Habitat fragmentation has been found to negatively impact lemur populations, particularly folivores, emphasizing the importance of on-the-ground conservation action.
A new report models the effects of deforestation and climate change on critically endangered ruffed lemur species in Madagascar, estimating suitable rainforest habitat could be reduced by up to 59% from deforestation. Protecting protected areas is key to conserving biodiversity, the research suggests.
A new study reveals that Madagascar's few remaining patches of lowland rainforest host the highest levels of lemur abundance. Human encroachment in coastal areas disproportionately threatens these primates, emphasizing the need for research and conservation management to protect them.
A Duke University study found that female lemurs' aggression may be programmed in the womb due to high levels of androstenedione. Females exposed to higher doses of this hormone during pregnancy grow up to be more aggressive as adults.
A study of lemur scents reveals that an individual's distinctive body odor reflects genetic differences in their immune system. Females pay more attention to the scents of males with different immune genes, which could lead to more diverse and resilient offspring.
A new study published in Scientific Reports reveals that degraded rainforest habitats are having an unhealthy impact on at least one species of Madagascar's treasured lemurs. Despite moderate levels of habitat fragmentation and disturbance, some groups of sifakas showed substantial resilience to these changes.
Researchers found that lemurs' gut microbes vary by species and habitat, affecting their ability to digest plant-based diets. The study suggests that leaf-eating sifakas may be more sensitive to forest loss due to their specialized microbial mix.
A study led by Duke University estimates total population sizes and geographic ranges for 19 lemur species across Madagascar using trees as a proxy. The findings suggest that not all lemurs are endangered, with some species having healthy populations remaining, while others face significant declines due to habitat loss and hunting.
Biological anthropologists from the University of Texas at Austin have discovered three previously unknown ancient primates in San Diego County. The fossils date back 42 million to 46 million years, with estimated weights ranging from 113 to 796 grams.
Researchers re-examined ancient Propotto leakeyi fossil and found it was an early relative of the aye-aye, challenging the long-held view that lemurs descended from a single wave to Madagascar. The study proposes two lineages split in Africa before coming to Madagascar, suggesting a more complex evolutionary history.
A new study reveals that tropical forest conservation policies are not compensating the world's poorest people, despite good intentions. Researchers found that local communities face significant economic costs and are often arrested for cultivating ancestral land, highlighting the need for proper compensation to be affordable.
A new study by Rice University ecologists suggests that saving lemurs could be key to saving the island's largest trees. Lemurs disperse seeds of many hardwoods, but their loss may lead to a change in forest composition, reducing carbon sequestration potential.
A study on ring-tailed lemurs found that physical injury alters their natural scents, making them detectable to others. This change in scent allows males to detect weakness and aggression from injured peers, leading to more competitive behavior.
Male lemurs' hormone levels increase with child care behaviors, suggesting that elevated androgens may facilitate rather than inhibit infant care. This challenges the long-held assumption that high androgen levels impede paternal bonding.
A recent study published in PLOS ONE found that the occurrence probability of three lemur species increases with forest fragment size, while its impact on isolation varies depending on the species. The researchers suggest that maintaining habitat area may be crucial to maintaining populations in a fragmented landscape.
In a study on ring-tailed lemurs, researchers found that those who learned to solve tasks received more affiliative behaviors, such as grooming, from others. This increased their social position and became more influential within their group.
Princeton University researchers found that lemurs who solve problems gain more social connections and attention from others. By observing the behavior of successful individuals, other lemurs are more likely to adopt similar skills and strategies.
Red-fronted lemurs demonstrate an ability to recognize individuals of their own species from photographs, with females showing a stronger response than males. The animals' capacity for cross-modal recognition suggests that they use both sight and smell to differentiate between conspecifics and heterospecifics.
Red-fronted lemurs demonstrate ability to differentiate between conspecifics and closely related sister species based on facial pattern and color variations. The study found that females showed a stronger reaction than males, indicating visual and olfactory signals play crucial role in species recognition.
Researchers tracked Henst's goshawk population by analyzing strontium isotopes in leaves and animal remains, revealing the birds' hunting habits. The findings suggest that goshawks mainly inhabit lower elevations in forest areas vulnerable to human impacts, which could inform conservation efforts.
A new study finds that bamboo lemurs, giant pandas, and red pandas share 48 gut microbes in common, highlighting the importance of diet in shaping their microbial ecosystems. The researchers discovered these microbes by analyzing feces from each species and comparing them to those of closely related animals.
A recent study on lemurs found that a similar diet leads to identical gut microbiomes, highlighting the importance of diet in shaping microbial ecosystems. The researchers also discovered common metabolic pathways between lemurs and humans with inflammatory bowel disease (IBD), raising questions about their role in human health.
Research found that red-bellied lemurs with strong social bonds have similar gut microbiomes, which may contribute to their immunity. The study suggests that sharing a similar microbiome within a social group can have a positive health impact and potentially prevent infections.