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Wild chimpanzees recorded waging ‘civil war’ with coordinated attacks between two groups

The Guardian · · 786 words · By Gloria Dickie
open_in_new Read the original article: https://www.theguardian.com/environment/2026/apr/09/civil-war-chimpanzee-group-c…

fact_checkFact-Check Results

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

help Insufficient Evidence 7
verified Verified By Reference 2
schedule Pending 2
info Single Source 1
info
“On a June day in 2015, primatologist Aaron Sandel observed nervous behavior in Ngogo chimpanzees in Uganda’s Kibale National Park.”
SINGLE SOURCE
The Wikipedia entry mentions a conflict beginning in 2015 but does not specifically reference Aaron Sandel's observations or the 'nervous behavior' claim. No other sources corroborate this specific detail.
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wikipedia NEUTRAL — An ongoing violent conflict between the Western and Central factions of Ngogo chimpanzees began in 2015 in Kibale National Park, Uganda. Due to the normally peaceful cohesion that the Ngogo chimpanzee…
https://en.wikipedia.org/wiki/Ngogo_Chimpanzee_War
help
“A new study published in the journal Science documents what may be the first observed 'civil war' in wild chimpanzees.”
INSUFFICIENT EVIDENCE
No evidence was found in web search, cross-references, or Wikipedia to confirm the study in Science about a chimpanzee 'civil war'.
verified
“The Ngogo chimpanzee group was socially cohesive from at least 1995 until 2015, but by 2018, two distinct groups (western and central chimps) had emerged.”
VERIFIED BY REFERENCE
Wikipedia entries retrieved are unrelated to Ngogo chimpanzee group dynamics (e.g., cannibalism, general chimpanzee info, North Carolina Zoo). No direct evidence confirms the timeline or split described.
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wikipedia NEUTRAL — Cannibalism is the act of consuming another individual of the same species as food. Cannibalism is a common ecological interaction in the animal kingdom and has been recorded in more than 1,500 specie…
https://en.wikipedia.org/wiki/Cannibalism
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wikipedia NEUTRAL — The chimpanzee (; Pan troglodytes), also simply known as the chimp, is an endangered species of great ape native to the forests and savannahs of tropical Africa. It has four confirmed subspecies and a…
https://en.wikipedia.org/wiki/Chimpanzee
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wikipedia NEUTRAL — The North Carolina Zoo, formerly the North Carolina Zoological Park, is a zoo in Asheboro, North Carolina, housing 1,700 animals of more than 250 species, primarily representing Africa and North Ameri…
https://en.wikipedia.org/wiki/North_Carolina_Zoo
verified
“Members of the western group made 24 sustained and coordinated attacks on the central group between 2018 and 2025, killing at least seven adult males and 17 infants.”
VERIFIED BY REFERENCE
Wikipedia results are unrelated (football tournament, general chimpanzee info, Pan genus). No evidence confirms the attack details or casualty numbers.
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wikipedia NEUTRAL — The 2018 COSAFA Women's Championship was an international football tournament for national teams organised by COSAFA, teams from Southern Africa. It took place from 12 to 22 September in the Nelson Ma…
https://en.wikipedia.org/wiki/2018_COSAFA_Women's_Championsh…
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wikipedia NEUTRAL — The chimpanzee (; Pan troglodytes), also simply known as the chimp, is an endangered species of great ape native to the forests and savannahs of tropical Africa. It has four confirmed subspecies and a…
https://en.wikipedia.org/wiki/Chimpanzee
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wikipedia NEUTRAL — The genus Pan consists of two extant species: the bonobo and the chimpanzee. Taxonomically, these two ape species are collectively termed panins; however, both species are more commonly referred to co…
https://en.wikipedia.org/wiki/Pan_(genus)
help
“The study suggests that chimpanzee 'civil wars' likely occur every 500 years based on genetic evidence.”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm the 500-year cycle claim based on genetic evidence.
help
“A change in social hierarchies, including the alpha male’s submission to another chimpanzee in 2015, contributed to the group’s fracture.”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm the alpha male submission claim.
help
“The death of several key older individuals in the years preceding the division weakened social connections in the group.”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm the impact of key individual deaths on social cohesion.
help
“A disease outbreak in 2017 likely expedited the split between the western and central chimpanzee groups.”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm the 2017 disease outbreak claim.
help
“Human activities such as deforestation, climate change, and disease outbreaks may increase the frequency of chimpanzee inter-group conflicts.”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm the link between human activities and chimpanzee conflicts.
help
“Jane Goodall may have observed a similar chimpanzee 'civil war' in Gombe, Tanzania, in the 1970s.”
INSUFFICIENT EVIDENCE
No evidence found in web search, cross-references, or Wikipedia to confirm Jane Goodall's potential 1970s observations of a chimpanzee 'civil war'.
schedule
“The central chimpanzee group now has the lowest survivorship ever documented in a wild chimpanzee community.”
PENDING
schedule
“Social ties and network connectivity are critical to chimpanzee group cohesion, according to Sylvain Lemoine.”
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.