All articles tagged with #primates
A new PLOS Biology study analyzing 2,025 primates across 41 species argues that humans’ near-90% right-handedness arises from the combined effects of rapid brain growth and a long leg-to-arm ratio from sustained bipedalism: with legs freed from locomotion, the hands could specialize in manipulation, and the larger brain provided the cognitive substrate, making humans the extreme outlier among primates.
A Oxford-led study analyzing 2,025 primates suggests humans' extreme right-handedness arose from two key evolutionary milestones—upright walking and brain expansion—that shifted early hominins from mild to strong right-hand bias, with Homo species showing increasing dominance and Homo floresiensis exhibiting weaker bias; the findings support a two-stage process and raise questions about why left-handedness persists and how culture reinforces right-handedness.
Anthropologist David R. Samson argues that humans biologically need about 9.5 hours of sleep but typically get under seven, because ancestral shifts from tree to ground sleeping favored short, deep, REM-rich bouts that free time for foraging, social learning and tool use. Drawing on chimpanzee nest-building and fieldwork with the Hadza and BaYaka, the book frames nest-building as a cognitive catalyst in primate evolution, while highlighting sleep’s broad importance to health and cognition and noting some gaps in the comparison to other species.
ScienceAlert covers a heated debate: Jenny Graves argues the Y chromosome is degrading and could vanish in millions of years, but this forecast is contested and uncertain. Other researchers, notably MIT’s Jenn Hughes, contend core Y genes are deeply conserved in primates and the chromosome is more likely to persist, even as some species have shed or replaced its sex-determining role. The evidence shows sex-determination systems can evolve rapidly, and while the Y’s fate remains unresolved with wide error margins, males would likely persist if alternative mechanisms arise.
Researchers studying 230 Barbary macaques in Gibraltar found those with more access to tourists’ calorie-dense snacks eat dirt about 12 times a week, suggesting geophagy buffers the digestive impact of high-calorie, low-fiber junk food and may aid gut bacteria; the behavior is more common in seasons with more tourists and is absent in groups with no tourist access.
If humans disappeared, Earth would reorganize with certain species gaining advantages. Birds—especially corvids and parrots—show high problem-solving and could rise to prominence, while adaptable mammals like rats or feral cats and dogs might thrive briefly. Primates and large marine mammals face cognitive or physical constraints, and there is no single species poised to fully replace humans as the dominant force on the planet.
Paleontologists in Colorado's Denver Basin uncovered tiny Purgatorius teeth, extending the earliest primates' range south of Montana and suggesting rapid diversification after the K/Pg extinction; the finds, possibly from a new early-diverging Purgatorius, also highlight sampling gaps that may have hidden southern occurrences.
Punch’s viral moment at a Japanese zoo spotlights broader animal-welfare issues, including captivity’s psychological toll on primates and the gap between online empathy and real protections; activists urge reforms and sustained advocacy beyond cute posts.
An illustrated tour of the world’s strongest primates—from gorillas and chimpanzees to gibbons, indris, muriquis and the extinct gigantomyth Gigantopithecus—explains how size, leverage, grip, and locomotion shape their power; humans are not built for raw power but excel at throwing, chimp muscles pack more power per kilogram than ours, and popular belief that a fight with a chimp would be winnable persists (22% of US men according to YouGov).
New science suggests that same-sex relations among primates may confer evolutionary benefits beyond reproduction by strengthening social bonds, forging alliances, and stabilizing group dynamics, illustrating that natural selection can favor behaviors that don’t fit the traditional survival script.
In nine elderly monkeys, daily 40 Hz sound for one week increased cerebrospinal fluid levels of β-amyloid by about 200%, suggesting the brain’s waste-clearance system was more active and the effect lasted five weeks. The results are preliminary, focusing on biomarkers rather than memory outcomes, and human trials are needed to determine real-world therapeutic potential.
A Nature Ecology & Evolution study synthesizes data showing same-sex sexual behavior in 59 nonhuman primates (including bonobos, chimpanzees and macaques) with repeated instances in 23 species, suggesting such behavior helps reduce social tension, build bonds, and manage competition under environmental stress—driven by genetics and context rather than reproduction, though not all species are equally studied.
Primates are a highly diverse mammal group with over 200 species, found across multiple continents, but the majority are threatened with extinction. The article covers primate classification, characteristics, and interesting facts about their evolution and conservation status.
The article discusses a paradigm shift in neuroscience towards neuroethology, which studies animals in naturalistic settings to better understand complex cognitive behaviors like social interactions and decision-making, moving beyond traditional lab-based methods to capture the brain's functioning in real-world contexts.
A study from the University at Buffalo reveals that human saliva has evolved significantly from primates, with gene duplications and changes influenced by diet and environment, highlighting saliva's potential in personalized medicine and oral health diagnostics.