A study of fossilized molars reveals that many ancient primates went extinct due to reasons unrelated to food competition with rodents. Most stem primates ate different types of food than the rodents, casting doubt on the theory that rodent competition was the main reason for their decline.
A study by Georgia State University found that genetics and specific brain regions are linked to sex differences in chimpanzees' scratching behavior, a common indicator of anxiety. The researchers identified the vasopressin V1a receptor gene as a key factor, with males showing higher rates of scratching and females showing lower rates.
A single monoclonal antibody isolated from an Ebola survivor protected non-human primates even after lethal infection, offering hope for a potential treatment. The findings suggest a novel site of vulnerability on the Ebola virus and may lead to effective therapy.
Researchers detect cryptochrome 1 in photoreceptors of dog-like carnivores and primates, hinting at a magnetic sense linked to the visual system. The molecule's presence suggests that these animals may use it to perceive the Earth's magnetic field.
A single monoclonal antibody isolated from a human Ebola survivor has been shown to completely protect monkeys from lethal infection with the virus. The antibody, known as mAb114, was effective even when given five days after exposure, suggesting it could be used as a potential treatment for human cases.
Research at University of Kent reveals that adult male chimpanzees base grooming interactions on potential social partners nearby. Contrary to existing theories, these decisions are driven by direct benefits rather than trust-based relationships.
Researchers observed a female orangutan being killed by another female, with a male recruited as a hired gun. Female-female aggression is rare, and the case defies typical patterns of joint coalitional killings.
New research on ancient rodent Paramys reveals its brain was larger than expected but smaller in the neocortex region. This suggests that brain evolution occurred differently in early rodents compared to primates, highlighting the limitations of using brain size as a measure of intelligence.
Researchers identify SIM4, a new part of the TRIM5alpha protein that attaches to SUMO and activates an immune response against HIV. This finding could lead to optimizing gene therapy by tweaking the activity of antiviral factors.
Researchers found a change in gene expression that may have contributed to the development of a weight-bearing structure in humans, allowing for bipedalism. The study identified a region in the human genome responsible for controlling armor plate size in threespine sticklebacks, which expressed higher levels of GDF6 in freshwater fish.
Two studies found a liver-derived hormone, FGF21, that regulates sugar and alcohol intake in mice and primates. FGF21 suppresses sweet appetite by acting on the hypothalamus, a part of the brain that regulates food intake and energy homeostasis.
Researchers find that extinction of fruit-eating animals like primates and tapirs disrupts seed dispersal, leading to a decline in heavy-wooded trees and reduced carbon storage. This loss affects the ecosystem's ability to counter climate change.
Researchers found that ringtailed lemurs reserve vocal exchanges for individuals with whom they have close relationships, using them to maintain social bonds even when separated. This study highlights the importance of vocal interactions in establishing familiarity and closeness, a concept applicable to human communication as well.
Researchers found that humans are exceptionally short sleepers, getting an average of seven hours of sleep per night, whereas other primates need up to 17 hours. Human sleep is also more efficient, spending less time in light stages and more in deeper stages.
Researchers found pygmy slow lorises in Southeast Asia exhibit multiday torpor to conserve energy during food scarcity. This discovery highlights the possibility that hibernation may be used by further primate species beyond Madagascar.
A team of researchers from the University of Kansas has discovered a previously unknown species of early anthropoid primate, Apidium zuetina, in the Libyan desert. The find provides evidence that climate change and environmental conditions played a significant role in shaping the evolution of these primates.
Researchers found that human brains have a subset of cells that fire in response to inputs from both eyes, similar to those in rodents. This discovery suggests that humans have the best possible visual system, with primitive pathways allowing for quick spotting of danger and complex behaviors.
A new study found that nonhuman primates in Bangladesh and Cambodia harbor diverse astroviruses, including human astroviruses, challenging the paradigm that AstV infection is species-specific. The researchers also detected recombinant viruses that may be more efficiently transmitted.
The study maps gene expression during early development of mice and common marmosets, pinpointing changes that regulate pluripotency. The complex network of gene regulation supporting pluripotency is analyzed, with implications for cell reprogramming and assisted conception.
A large-scale study reveals the hepatitis A virus is likely of animal origin, with viruses from small mammals showing similarities to the human virus. The discovery offers new perspectives for risk assessments and may hint at a distant ancestry in primordial insect viruses.
A recent discovery of a small-bodied ape in Spain shares features of both catarrhines and great apes, suggesting that the last common ancestor of all apes may have been less great ape-like than previously assumed. This finding has significant implications for our understanding of hominoid evolution.
Researchers found that spider monkeys can distinguish between ripe and unripe fruit odors with over 70% accuracy, a skill honed through coevolution with tropical trees. The study suggests that a species' sense of smell is not inherently good or bad, but rather adaptive to their ecological niche.
Researchers found a clear age effect in human children's ability to use tools, with 2-year-olds struggling but improving by 4 years old. In contrast, nonhuman primates rely on their sense of touch, known as haptic senses, to complete spatial reasoning tasks.
Researchers found that monkeys and humans perceive the Delboeuf illusion in a similar way, with both species misjudging dot size depending on outer ring size. This suggests that primates share similarities in their perceptual systems, making them an appropriate model for studying human perception.
Researchers studying 2-million-year-old human fossils from South Africa found that early hominins had hearing patterns resembling those of chimpanzees, but with slight variations. The discovery suggests that early humans may have had better hearing in certain frequency ranges than other primates.
A new model proposes that Darwinius, the famous primate fossil, shares more in common with modern lemurs than previously thought. The study re-examined the interpretation of Darwinius based on its dental eruption sequence, finding it had a similar pattern to that of lemurs.
Genetic mutations in Ebola virus appear to block antibody-based treatments from warding off infection. The mutations, or 'escape variants,' have implications for the continued development of therapeutics to treat Ebola virus disease, which has claimed over 11,000 lives in West Africa.
Northwestern researchers identify infants' ability to group objects by name as predictor of later language development, highlighting importance of early talking to young children.
Researchers found that primates, like humans, recover partial motor control within the first six months after a spinal cord injury, whereas rats show limited recovery. The primate-specific mechanism of recovery involves detour circuits around lesions, restoring communication between brain and spinal cords.
Scientists have discovered a new virus in seals that is closely related to human hepatitis A virus, raising concerns about the emergence of hepatitis A. The researchers found the virus in harbor seals off the coast of New England and suggest it may be present in other wildlife species.
Researchers identified a new virus, phopivirus, in seals genetically similar to hepatitis A, suggesting it may have originated in animals. The discovery provides clues on the emergence of hepatitis A and highlights the importance of studying wildlife reservoirs of zoonotic viruses.
Researchers discovered that lentiviruses closely related to HIV have infected primates in Africa as far back as 16 million years. The TRIM5 protein, an antiviral gene, has evolved to protect host cells from infection and provides insight into the evolution of viruses.
Researchers developed an EBV vaccine using nanoparticles that induce potent neutralizing antibodies in mice and nonhuman primates. This approach is promising for developing an effective EBV vaccine for humans.
A new study reveals that infant marmosets develop vocalizations influenced by cues from caregivers, suggesting a potential key to understanding human-like vocal development in primates. The research found a strong correlation between parental responses and the timing of the cries-to-phees transition.
A study published in The New England Journal of Medicine reports that an experimental compound, AVI-7288, protected nonhuman primates against the deadly Marburg virus. The compound showed efficacy even when administered after exposure to the virus. Phase I clinical trial results also indicated safety and tolerability.
University of Adelaide researchers found a significant correlation between brain volume and blood flow rate in primates, indicating faster cognitive ability. The study suggests that brain metabolic rate increased with brain size, leading to higher intelligence.
A collaborative team from UTMB and NIH develop an inhalable vaccine that protects primates against Ebola. The aerosol delivery method has shown promising results, with a single vaccination providing protection against the severe disease and death caused by lethal Ebola infection.
Researchers at Duke University have successfully established brain-to-brain networks in primates and rodents, allowing them to work together to complete simple tasks. The brain networks, or Brainets, enable animals to exchange sensory and motor information in real-time, controlling movement and even predicting weather patterns.
Researchers have visualized the oldest known Old World monkey skull, revealing a tiny but remarkably wrinkled brain. The ancient creature's brain supports the idea that brain complexity can evolve before brain size in primates, contradicting conventional wisdom.
A new method is being used to screen primates in remote locations without invasive sampling techniques. Saliva from discarded ropes is collected and tested for viral diseases, providing valuable information on zoonotic pathogens.
A new study led by Beth Israel Deaconess Medical Center shows that a novel HIV-1 vaccine regimen provides complete protection against simian immunodeficiency virus in half of vaccinated non-human primates. The vaccine regimen involves a viral vector boosted with a purified envelope protein, demonstrating improved protection over previo...
A pre-clinical study of an HIV vaccine regimen showed complete protection from infection in half of the vaccinated non-human primates. The 'heterologous prime-boost' vaccine approach is being evaluated in a phase 1/2a clinical trial for safety and immunogenicity in healthy volunteers.
Wild kangaroos show a consistent preference for using their left hands for actions like grooming and picking leaves. The finding expands our understanding of handedness in animals and may offer insights into neuropsychiatric conditions such as schizophrenia and autism.
A new study published in Animal Behaviour found that male mountain gorillas' relationships with infants are influenced by their social rank, not paternity. Dominant males tend to be more nurturing and have stronger relationships with infants in the troop.
A study found that physical contact during social grooming increases the risk of gastrointestinal parasites in brown spider monkeys. The researchers analyzed data from 12 individual monkeys and found a strong correlation between grooming interactions and parasite infections, particularly with roundworms Strongyloides and Trichostrongylus.
A study found that humans are more commonly afflicted with spinal disease due to their unique vertebrae shape, which shares similarities with non-human primates. Researchers studied human, chimpanzee, and orangutan vertebrae to uncover the link between vertebral shape and disc herniation.
A new study by Yale University reveals that early human ancestors may have had precision grip capabilities comparable to modern humans. The research team created a kinematic model of the thumb and index finger of living primates and fossil remains, finding that even ancient species like Australopithecus afarensis had impressive dexterity.
A commonly prescribed antidepressant caused up to six-fold increase in coronary artery atherosclerosis in non-human primates. Researchers found that female monkeys treated with the medication developed three times more atherosclerosis than those given a placebo.
A new study found that 13 of 23 protected areas in Ivory Coast had lost their entire primate populations due to illegal cocoa farming. The researchers also discovered that 20 of the areas had unauthorized villages with nearly 30,000 people, highlighting the scale of deforestation caused by cocoa production.
A 17-million-year-old beaked whale fossil found in Kenya has provided the first exact date for East Africa's mysterious uplift. The whale was stranded inland at a time when the continent was still at sea level and covered with forest, leading to changes in vegetation that drove human evolution.
A Gombe Stream National Park study reveals that people are likely exposing endangered primates to Cryptosporidium, a parasite that may be contributing to their decline. The researchers found that some chimpanzees are infected with a species of Cryptosporidium associated with pigs, suggesting cross-species contamination.
Researchers found that targeting a single protein, VP24, was sufficient to protect monkeys from Ebola virus infection. The medication, AVI-7537, also reduced viral load and liver/kidney damage in infected animals.
Researchers at the University of Iowa found that pigeons can categorize and name objects, similar to how children learn words. The study used a computerized task that allowed pigeons to learn 16 categories simultaneously, comparable to how humans learn categories.
A new study reveals that the oldest primate ancestors lived in trees, accessing food sources unavailable to ground-dwelling species. The discovery provides evidence of arboreal life evolving early in the history of primates, with Purgatorius, a tiny tree shrew-like creature, being estimated to have weighed about 3.5 ounces.
Researchers found evidence of arboreality playing a key role in primate evolution, suggesting subtle changes allowed for easier navigation and better access to food in the trees. The discovery challenges traditional textbook illustrations and provides the oldest fossil evidence to date for this concept.
A recent study by Ria Ghai has identified three genetically distinct groups of whipworms, with only one being transmissible between humans and non-human primates. This discovery has significant public health implications and highlights the need for conservation efforts to protect endangered species.
A study by Timothy M. Ryan and Colin N. Shaw found that the agriculturalists had significantly lower bone mass than foragers, while the bone characteristics of more mobile foragers overlapped with those of nonhuman primates.
Researchers found that parrots and crows, particularly New Caledonian crows, Goffin cockatoos, Black Palm cockatoos, and Kea, demonstrated complex object-object combinations during play. These species also combined their toys with playground objects at high rates.
A new study examines how parasites impact primate culture, finding that socially transmitted pathogens increase with learning from others and environmentally transmitted pathogens with exploratory behavior. This research sheds light on the evolutionary pressures driving primate cultural development.
Researchers found that subtle shifts in frontal and parietal lobes of the brain are linked to superior cognition. The frontoparietal network plays a key role in analysis, memory retrieval, abstract thinking, and problem-solving.