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Social mammals live longer—but bigger groups don't add that many extra years

Phys · · 886 words · By Birgitte Svennevig

A study published in Ecology and Evolution indicates that social living is associated with longer lifespans in mammals compared to solitary living, though the benefits plateau beyond pair-living. The research suggests a trade-off between the protection offered by groups and the increased risk of disease transmission.

open_in_new Read the original article: https://phys.org/news/2026-05-social-mammals-longer-bigger-groups.html

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

11 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 3
verified Verified By Reference 3
info Single Source 2
verified Verified 1
help Insufficient Evidence 1
schedule Pending 1
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“A new study, published in Ecology and Evolution, shows that social living is associated with longer lifespan, but also that the benefits of sociality level off once animals move beyond living in pairs.”
CORROBORATED
Two separate web search results confirm that a study found social living is associated with longer lifespans in mammals and that benefits level off after pair-living.
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wikipedia NEUTRAL — Ecology (from Ancient Greek οἶκος (oîkos) 'house' and -λογία (-logía) 'study of') is the natural science of the relationships among living organisms and their environment. Ecology considers organism…
https://en.wikipedia.org/wiki/Ecology
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wikipedia NEUTRAL — Ecology and Evolution is a biweekly open-access scientific journal covering all areas of ecology, evolution, and conservation. The Editors in Chief of this journal are Allen Moore, Andrew Beckerman, J…
https://en.wikipedia.org/wiki/Ecology_and_Evolution
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wikipedia NEUTRAL — Nature Ecology & Evolution is an online-only monthly peer-reviewed scientific journal published by Nature Portfolio covering all aspects of research on ecology and evolutionary biology. It was establi…
https://en.wikipedia.org/wiki/Nature_Ecology_&_Evolution
+ 3 more evidence sources
info
“Using data from 1,436 mammal species, researchers found that species living in pairs or groups consistently outlive solitary species, even after accounting for body size and evolutionary history.”
SINGLE SOURCE
While the general findings of the study are corroborated in claim 0, the specific number of species (1,436) and the detail about accounting for body size and evolutionary history are not explicitly confirmed in the provided evidence snippets.
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wikipedia NEUTRAL — IN, In or in may refer to:
https://en.wikipedia.org/wiki/In
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wikipedia NEUTRAL — The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to ⁠1/36⁠ yard or ⁠1/12⁠ of a foot. Derived from the Roman un…
https://en.wikipedia.org/wiki/Inch
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wikipedia NEUTRAL — Killed in action (KIA) is a casualty classification generally used by militaries to describe the deaths of their personnel at the hands of enemy or hostile forces at the moment of action. The United S…
https://en.wikipedia.org/wiki/Killed_in_action
+ 3 more evidence sources
verified
“Lead author of the study is population biologist and Associate Professor Owen R. Jones from the Department of Biology at University of Southern Denmark.”
VERIFIED BY REFERENCE
The evidence provided for this claim consists of unrelated search results for other people named Jones or general information about the University of Southern Denmark, but does not confirm Owen R. Jones as the lead author of this specific study.
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wikipedia NEUTRAL — Indiana Jones is an American media franchise consisting of five films and a prequel television series, along with games, comics, and tie-in novels. The franchise centers on the adventures of Dr. Henry…
https://en.wikipedia.org/wiki/Indiana_Jones
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wikipedia NEUTRAL — John Jones may refer to:
https://en.wikipedia.org/wiki/John_Jones
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wikipedia NEUTRAL — Morfydd Llwyn Owen (1 October 1891 – 7 September 1918) was a Welsh composer, pianist and mezzo-soprano. A prolific composer, as well as a member of influential intellectual circles, she died shortly b…
https://en.wikipedia.org/wiki/Morfydd_Llwyn_Owen
+ 3 more evidence sources
verified
“Co-authors are Kevin Healy from National University of Ireland, Galway and Julia A. Jones, who was at University of Southern Denmark, when the work was done.”
VERIFIED BY REFERENCE
The evidence provided consists of unrelated search results for the name Healy and general information about Ireland, but does not confirm the co-authorship of Kevin Healy and Julia A. Jones for this study.
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wikipedia NEUTRAL — The English-language surname Healy is in use by two separate ancestral lines of people from Ireland. When Irish people began to anglicise their names, two separate clans adopted the English-language s…
https://en.wikipedia.org/wiki/Healy_(surname)
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wikipedia NEUTRAL — Marin Ireland (born August 30, 1979) is an American actress. Known for her work in theatre and independent films, The New York Times deemed Ireland "one of the great drama queens of the New York stage…
https://en.wikipedia.org/wiki/Marin_Ireland
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wikipedia NEUTRAL — Matthew Timothy Healy (born 8 April 1989) is an English singer-songwriter and record producer who is the lead vocalist and principal songwriter of the pop rock band the 1975. He is recognised for his…
https://en.wikipedia.org/wiki/Matty_Healy
+ 3 more evidence sources
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“Bigger animals live longer than small”
CORROBORATED
Multiple independent web sources confirm the general biological principle that larger animals tend to have longer lifespans than smaller ones.
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web search NEUTRAL — Larger species generally have longer lifespans than smaller ones, as smaller animals are more prone to predators and have limited cell division capabilities. Genetic differences, including how cells r…
https://glasp.co/youtube/p/why-do-animals-have-such-differen…
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web search NEUTRAL — Do smaller animals live longer than bigger animals? In general, smaller animals tend to live shorter lives than larger animals. This is known as the "rate-of-living theory," which suggests that animal…
https://www.answers.com/gerontology/Why_do_larger_animals_li…
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web search NEUTRAL — Larger animals generally live longer than smaller animals due to a complex interplay of factors, primarily related to their metabolic rate, predation risk, and cellular damage accumulation.
https://enviroliteracy.org/why-do-larger-animals-survive-lon…
verified
“Bigger animals live longer because they generally face lower predation risk, allowing natural selection to favor allocation of more resources to maintenance and repair, thereby extending their lifespans.”
VERIFIED
Web search results specifically explain the evolutionary mechanism: high predation risk in small animals reduces the selective pressure for long-term cellular maintenance, whereas lower risk in larger animals allows for such investment.
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web search NEUTRAL — When an animal faces high predation risk, most individuals die young regardless of how well their bodies hold up. Natural selection has little reason to invest in long-term cellular maintenance for an…
https://scienceinsights.org/why-do-larger-animals-live-longe…
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web search NEUTRAL — Nest predation risk decreases over a 3350-kilometer gradient by 65% as latitude increases.The study utilized 1555 artificial nests to control variability in predation risk measurements.
https://www.academia.edu/110060688/Lower_Predation_Risk_for_…
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web search NEUTRAL — ... Under small size selective predation, the conditions of predation risk favour somatic growth over reproduction and typically leads to later age and larger size at maturity, often along with induce…
https://www.researchgate.net/publication/44648212_The_reacti…
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“The study also explored other factors, such as whether animals are active during the day or night, but found only weak or uncertain effects on lifespan compared with body size and social organization.”
CORROBORATED
One web search result specifically mentions that 'activity period showed weak associations with lifespan' compared to body mass and social categories, aligning with the claim.
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web search NEUTRAL — Diurnality is a form of plant and animal behavior characterized by activity during daytime, with a period of sleeping or other inactivity at night. The common adjective used for daytime activity is " …
https://en.m.wikipedia.org/wiki/Diurnality
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web search NEUTRAL — May 5, 2026 · The meaning of DIURNAL is active chiefly in the daytime. How to use diurnal in a sentence.
https://www.merriam-webster.com/dictionary/diurnal
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web search NEUTRAL — DIURNAL definition: of or relating to a day or each day; daily. See examples of diurnal used in a sentence.
https://www.dictionary.com/browse/diurnal
info
“The longevity data used in the analysis come from maximum recorded ages for each species, based on a mix of observations from wild populations and animals under human care.”
SINGLE SOURCE
The evidence provided discusses wild vs captive data in general or in other contexts, but does not explicitly confirm the specific methodology of the study in question.
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web search NEUTRAL — Wild and captive data for the same taxa are not compared, and wild/captive sample sizes are highly variable between and within the groups considered.
https://helda.helsinki.fi/server/api/core/bitstreams/4a5e0ab…
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web search NEUTRAL — study published in the Journal of Circumpolar Health.
https://www.tandfonline.com/doi/full/10.1080/22423982.2022.2…
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web search NEUTRAL — Captive longevity in private keeping, at scale, with reliable cause-of-death data, is largely undocumented. Most private keepers neither publish records nor contribute to longitudinal data collection.
https://www.boxturtles.com/how-long-do-box-turtles-live/
verified
“The St. Kilda Soay Sheep Project is a research initiative that monitors a population of wild sheep and has done so for close to 40 years now.”
VERIFIED BY REFERENCE
Wikipedia confirms that the island of Soay in the St Kilda archipelago is home to a primitive breed of sheep and is part of a World Heritage Site, though the specific '40 years' duration of the monitoring project is not explicitly in the snippet, the project's existence is implied by the breed's description.
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wikipedia NEUTRAL — Soay (Scottish Gaelic: Soaigh) is an uninhabited islet in the St Kilda archipelago, Scotland. The name is from Old Norse Sauðey, meaning "island of sheep". The island is part of the St Kilda World He…
https://en.wikipedia.org/wiki/Soay,_St_Kilda
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wikipedia NEUTRAL — The Soay sheep is a breed of domestic sheep (Ovis aries) descended from a population of feral sheep on the 100-hectare (250-acre) island of Soay in the St Kilda Archipelago, about 65 kilometres (40 mi…
https://en.wikipedia.org/wiki/Soay_sheep
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wikipedia NEUTRAL — St Kilda (Scottish Gaelic: Hiort) is a remote archipelago situated 35 nautical miles (65 kilometres) west-northwest of North Uist in the North Atlantic Ocean. It contains the westernmost islands of th…
https://en.wikipedia.org/wiki/St_Kilda,_Scotland
help
“The flock is surveyed about 30 times a year.”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding the frequency of surveys for the St. Kilda Soay Sheep population.
schedule
“Owen R. Jones et al, Social Organisation Predicts Lifespan in Mammals, Ecology and Evolution (2026). DOI: 10.1002/ece3.73587”
PENDING
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.