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A new study covering more than 1,400 mammal species found that animals living with companions<\/a> usually outlive solitary ones. <\/p>\n From tiny shrews to elephants, social species consistently showed longer lifespans. The findings are changing how scientists understand aging and survival in mammals.<\/p>\n Living together improves survival<\/p>\n Imagine a mouse moving through tall grass at dusk. Every sound could signal danger. Now picture a herd of zebras feeding together on open land. <\/p>\n While one zebra lowers its head to graze, another scans the horizon. Predators become harder to avoid when you are alone.<\/p>\n For decades, researchers suspected that this kind of shared vigilance might help animals survive<\/a> longer. <\/p>\n Group living can reduce the chances of being eaten, improve access to food, and increase protection for young animals. In theory, species that avoid early death should evolve slower aging and longer lifespans.<\/p>\n Still, proving that idea turned out to be difficult. Earlier studies produced conflicting results. One major analysis from 2010 examined more than 250 mammal species and found no clear link between social living and lifespan. <\/p>\n A later review in 2020 reached a similar conclusion, noting that strong evidence remained limited.<\/p>\n New evidence changes views<\/p>\n The picture began to change in recent years as scientists gained access to larger datasets and better analytical tools.<\/p>\n In 2023, researchers led by Zhu studied around 1,000 mammal species and found that social animals generally lived longer than solitary ones. <\/p>\n The team also identified changes in gene activity connected to aging and immunity. Another study published in 2024 reported similar patterns across several animal groups.<\/p>\n Now researchers from the University of Southern Denmark<\/a> have carried out the largest analysis yet.<\/p>\n Led by Owen R. Jones, alongside Kevin Healy and Julia A. Jones, the study combined lifespan<\/a> and social behavior data from 1,436 mammal species.<\/p>\n Their conclusion was strikingly clear: mammals living in pairs or groups usually outlive species that live alone.<\/p>\n Predators influence lifespan<\/p>\n The researchers controlled for body size and evolutionary history to make sure the pattern was not caused by unrelated factors. Even after those adjustments, social species still showed longer lifespans.<\/p>\n The effect was not enormous, but it remained consistent across species with very different lifestyles and habitats.<\/p>\n For Jones, the explanation begins with predator defense. \u201cThe big one is defense against predation,\u201d he said.<\/p>\n \u201cSocial species, whether pairs or groups, benefit from increased vigilance. If you watch deer in a field, there\u2019s almost always at least one individual with its head up, scanning for danger.\u201d <\/p>\n \u201cThere is also the dilution effect, where the chance of being caught decreases when there are multiple targets.\u201d<\/p>\n In simple terms, living with others spreads risk. A predator hunting a herd has many possible targets, which lowers the danger for each individual animal.<\/p>\n One partner may suffice<\/p>\n One of the study\u2019s most surprising findings involved pair living.<\/p>\n Scientists expected group-living species to show the longest lifespans because larger groups provide more protection. <\/p>\n Yet pair-living mammals lived just as long, and in some cases slightly longer, than group-living ones.<\/p>\n The differences were small, but the result suggests that having one close companion<\/a> may provide most of the survival advantages of larger groups.<\/p>\n That raised an important question. Why does the benefit level off once groups become larger?<\/p>\n Disease reduces advantages<\/p>\n The answer may lie in disease transmission.<\/p>\n Animals living in large groups spend more time in close contact. They groom each other, sleep near one another, and share food and territory. Those behaviors increase the spread of bacteria, viruses, and parasites.<\/p>\n \u201cThe larger the group is, the higher risk of pathogen transmission,\u201d noted Jones.<\/p>\n The protective benefits of social living may therefore come with biological costs. Larger groups help reduce predation, but they also create ideal conditions for infections to spread.<\/p>\n Earlier molecular studies support this idea. Researchers have found that group-living mammals often show stronger activity in immunity-related genes, suggesting their bodies evolved extra defense against disease exposure.<\/p>\n Pair-living species may hit a useful balance. They gain social protection without carrying the same disease burden seen in large groups.<\/p>\n Social bonds reveal patterns<\/p>\n The study also highlights how scientific methods can shape conclusions.<\/p>\n Earlier research often measured sociality using average group size. But the newer studies treated social behavior as categories: solitary, pair-living, or group living.<\/p>\n That shift turned out to matter.<\/p>\n Moving from solitary life to pair-living represents more than a simple increase in numbers. It involves long-term bonds, cooperation, and coordinated behavior. Those social changes may influence survival in ways that raw group size cannot fully capture.<\/p>\n A stable pair behaves very differently from a temporary gathering of dozens of animals. Treating all social systems as simple numbers may hide important biological differences.<\/p>\n Body size still leads<\/p>\n Body size remains the strongest predictor of lifespan among mammals. Bigger animals still tend to live longer than smaller ones.<\/p>\n \u201cBigger animals live longer than small,\u201d said Jones. \u201cBut being social seems to pull species upward from the average lifespan expected for their body size.\u201d<\/p>\n The study found little evidence that social behavior changes the relationship between body size and lifespan. Instead, both factors appear to work independently.<\/p>\n An elephant benefits from its large body, but social living may add another layer of protection that pushes lifespan even further.<\/p>\n Social life affects aging<\/p>\n The researchers caution that their work cannot prove direct cause and effect. Lifespan records can be influenced by how closely species are studied, and captive animals often live longer than wild ones.<\/p>\n Still, the broader pattern is becoming difficult to ignore.<\/p>\n Across mammals, social behavior appears closely tied to aging and survival. That idea may even help explain human health.<\/p>\n Human connections may matter<\/p>\n \u201cWe often think of aging as pure biology at the cellular level. But we show that behavior and social life matter too,\u201d said Jones.<\/p>\n \u201cOver evolutionary time, living together changes how species allocate energy to maintenance, disease resistance and reproduction, and those changes become built into their physiology.\u201d<\/p>\n Humans already show strong links between social connection and long-term health. Studies repeatedly find that people with strong social ties tend to live longer and experience lower rates of illness.<\/p>\n \u201cIn humans, social connections are strongly linked to health and longevity,\u201d Jones noted. <\/p>\n \u201cUnderstanding how social organization shapes lifespan in other animals helps us understand aging as not just a medical phenomenon.\u201d<\/p>\n The idea is simple but powerful. Across the mammal world, companionship may do more than provide safety or cooperation. It may actually shape how long life lasts.<\/p>\n The study is published in the journal Ecology and Evolution<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Why do some mammals live only a few years while others survive for decades? Scientists usually link lifespan…\n","protected":false},"author":2,"featured_media":464061,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[61,60,82],"class_list":["post-464060","post","type-post","status-publish","format-standard","has-post-thumbnail","category-science","tag-ie","tag-ireland","tag-science"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/464060","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/comments?post=464060"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/posts\/464060\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media\/464061"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/media?parent=464060"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/categories?post=464060"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ie\/wp-json\/wp\/v2\/tags?post=464060"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}