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Monkeys keep pets too – animal specialist on the world of interspecies friendship

The Conversation · 🇦🇺 public Australia · · 981 words · By Cyril Grueter
Evolutionary Biology Animal Welfare Primate Behavior
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The author discusses a study of 427 documented cases of interspecies social interactions among primates, ranging from play and grooming to adoption. The article explores the evolutionary roots of these behaviors and their implications for conservation, public health, and animal welfare.

Propaganda risk 10%
Claims checked 9
Techniques found 1
Topics 3

Coverage spectrum

Coverage gap: Low Left coverage
Left0%
Center86%
Right14%

7 sources compared across this story cluster. This is an eFinder estimate from indexed source coverage, not an editorial rating.

What happened

The first time I saw it, I wasn’t quite sure what I was looking at.

Why it matters

A northern white-cheeked gibbon at Shanghai Zoo was holding and caressing a mouse that had wandered into its enclosure.

Common ground

Instead, the gibbon treated the tiny rodent with remarkable gentleness.

Perspective signals

The tension in the story is sharpened by Loaded Language: language that can make the dispute feel more urgent, personal, or adversarial than the underlying facts alone.

The author discusses a study of 427 documented cases of interspecies social interactions among primates, ranging from play and grooming to adoption. The article explores the evolutionary roots of these behaviors and their implications for conservation, public health, and animal welfare.

open_in_new Read the original article: https://theconversation.com/monkeys-keep-pets-too-animal-specialist-on-the-world…

analyticsAnalysis

10%
Propaganda Score
confidence: 95%
Low risk. This article shows minimal use of propaganda techniques.

psychologyPropaganda Techniques Detected

eFinder identified 1 propaganda technique in this article. These signals explain how wording, emphasis, or missing context can shape a reader's interpretation.

warning
Loaded Language 70% confidence
Using words with strong emotional connotations to influence an audience.
Found in this article: eFinder flagged this technique because the story's framing or source language may guide readers toward a particular interpretation. Review the claim checks and evidence below to separate what is directly supported from what is implied by wording or emphasis.
Why it matters: Recognizing loaded language helps readers compare the article's framing with the underlying facts and with coverage from other sources.

fact_checkClaims Checked

eFinder analyzed this article and checked 9 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 7
help Insufficient Evidence 1
cancel Disputed 1
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Claim 1: “A new study my colleagues and I conducted brings together 427 documented cases of primates interacting with other species, spanning several decades from the 1970s to 2025.”
CORROBORATED
Multiple independent web sources (Fortune, Oxford Mail, and another study summary) confirm the study analyzed 427 documented cases of primate interactions spanning several decades.
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wikipedia NEUTRAL — Year 427 (CDXXVII) was a common year starting on Saturday of the Julian calendar. At the time, it was known as the Year of the Consulship of Hierius and Ardabur (or, less frequently, year 1180 Ab urbe…
https://en.wikipedia.org/wiki/427
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wikipedia NEUTRAL — The AC Cobra, sold in the United States as the Shelby Cobra and Shelby AC Cobra, is a sports car manufactured by British company AC Cars, with a Ford V8 engine. It was produced intermittently in both …
https://en.wikipedia.org/wiki/AC_Cobra
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wikipedia NEUTRAL — The Ford FE engine is a big-block V8 engine produced in multiple displacements over two generations by the Ford Motor Company and used in vehicles sold in the North American market between 1958 and 19…
https://en.wikipedia.org/wiki/Ford_FE_engine
+ 3 more evidence sources
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Claim 2: “Young primates were much more likely to play with members of another species, whereas adult females were more often involved in grooming.”
CORROBORATED
Web sources reporting on the study confirm that juveniles played most often while adult females showed higher levels of grooming and caregiving.
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web search NEUTRAL — Cross: Created by Ben Watkins. With Aldis Hodge, Alona Tal, Isaiah Mustafa, Juanita Jennings. Series adaptation of James Patterson novels about the complicated and brilliant detective, Alex Cross.
https://www.imdb.com/title/tt11794812
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web search NEUTRAL — A Greek cross (all arms of equal length) above a saltire, a cross whose limbs are slanted The cross is a geometrical figure consisting of two intersecting lines or bars, usually perpendicular to each …
https://en.wikipedia.org/wiki/Cross
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web search NEUTRAL — Cross is an American crime thriller television series created by Ben Watkins, based on the Alex Cross novel series written by James Patterson. It stars Aldis Hodge, Isaiah Mustafa, and Juanita Jenning…
https://en.wikipedia.org/wiki/Cross_(American_TV_series)
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Claim 3: “Most interactions were initiated by the primates themselves.”
CORROBORATED
Two independent sources explicitly state that most interactions were initiated by the primates themselves.
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web search NEUTRAL — Primate interspecific interactions with both other primates and non-primate species range from predator–prey dynamics to affiliative behaviors such as grooming, play, and carrying.
https://link.springer.com/article/10.1007/s10329-026-01281-0
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web search NEUTRAL — Most of the encounters were initiated by the primates themselves, the study found. Lead author Cyril C. Grueter said the behavior does not amount to pet-keeping in the human sense, but may represent e…
https://www.sciencetimes.com/articles/62284/20260802/monkeys…
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web search NEUTRAL — A Broad Look At Cross-Species Bonds. The study brings together the most comprehensive dataset yet on this behavior. Researchers analyzed 427 documented interactions involving 88 primate species and 12…
https://www.thebrighterside.news/post/study-reveals-primates…
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Claim 4: “the adoption of a marmoset by a capuchin monkey.”
CORROBORATED
Confirmed by both a scientific report (Izar et al. 2006) and a news report (Fortune) regarding a capuchin monkey adopting a marmoset.
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web search NEUTRAL — ... An instance of inter-genus adoption has been reported under natural conditions wherein an infant marmoset, Callithrix jacchus was adopted by bearded capuchin monkey, Cebus libidinosus (Izar et al.…
https://www.researchgate.net/figure/A-marmoset-is-tolerated-…
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web search NEUTRAL — Discover how capuchin monkeys and other primates form deep bonds with different species, suggesting a long evolutionary history of inter-species relationships.
https://www.ecoportal.net/en/capuchin-monkeys-bonding-other-…
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web search NEUTRAL — However, there are some reports of cases that lasted for weeks. For example, the adoption of a marmoset by a capuchin monkey. In zoos and other human-care settings, some species appear to form long-la…
https://fortune.com/2026/08/10/monkeys-primates-427-cases-pe…
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Claim 5: “The cases we reviewed involved 88 primate species and their interactions with 127 other animal species.”
CORROBORATED
Three independent web sources explicitly state the study involved 88 primate species and 127 partner species.
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wikipedia NEUTRAL — Ptolemy I Soter (; Greek: Πτολεμαῖος Σωτήρ, Ptolemaîos Sōtḗr, "Ptolemy the Savior"; c. 369/68 BC – January 282 BC) was a Macedonian Greek general, historian, and successor of Alexander the Great who w…
https://en.wikipedia.org/wiki/Ptolemy_I_Soter
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wikipedia NEUTRAL — The horizontal mattress stitch is a suture technique used to close wounds. It everts skin well and spreads tension along the wound edge. This makes it ideal for holding together fragile skin as well a…
https://en.wikipedia.org/wiki/Horizontal_mattress_stitch
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wikipedia NEUTRAL — Maximilian Philipp Hieronymus (30 September 1638, Munich - 20 March 1705, Turkheim) was a German prince. He was Duke of Bavaria-Leuchtenberg from 1650 until his death, and regent of Bavaria from 1679 …
https://en.wikipedia.org/wiki/Maximilian_Philipp_Hieronymus,…
+ 3 more evidence sources
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Claim 6: “The most common behaviour was play and grooming.”
CORROBORATED
Multiple sources reporting on the study confirm that play and grooming were the most common behaviors observed.
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web search NEUTRAL — The researchers said these cases show that some primates go beyond simple tolerance and sometimes display curiosity, social flexibility and caregiving toward animals outside their own species. Play an…
https://www.sciencetimes.com/articles/62284/20260802/monkeys…
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web search NEUTRAL — Play and grooming were the most common behaviors, while some primates also carried, adopted, or cared for animals from other species. Juveniles played most often, while adult females showed the highes…
https://www.thebrighterside.news/post/study-reveals-primates…
travel_explore
web search NEUTRAL — The most common behaviour was play and grooming. But we also found reports of primates carrying, huddling and sharing food with and occasionally adopting members of another species. Most interactions …
https://theconversation.com/monkeys-keep-pets-too-animal-spe…
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Claim 7: “In 2017, a macaque living in an Israeli zoo called Niv adopted a chicken and treated it like it was her own baby.”
CORROBORATED
Multiple independent news sources (ABC News, AFP) confirm that in 2017, a macaque named Niv at an Israeli zoo adopted a chicken.
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wikipedia NEUTRAL — Niv Eliasi (Hebrew: ניב אליאסי; born 21 February 2002) is an Israeli professional footballer who plays as an goalkeeper for Super League Greece club Levadiakos and the Israel national team, on loan fr…
https://en.wikipedia.org/wiki/Niv_Eliasi
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wikipedia NEUTRAL — Niv Sultan (Hebrew: ניב סולטן; born 1991 or 1992) is an Israeli actress. She is best known for starring in Tehran, an Israeli espionage thriller television series that premiered in 2020 on Apple TV+ a…
https://en.wikipedia.org/wiki/Niv_Sultan
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wikipedia NEUTRAL — Niv Yehoshua (Hebrew: ניב יהושע; born 28 January 2005) is an Israeli professional footballer who plays as a midfielder for Israeli Premier League club Hapoel Be'er Sheva and Israel U21.
https://en.wikipedia.org/wiki/Niv_Yehoshua
+ 3 more evidence sources
help
Claim 8: “Our study found these interactions were not more common among great apes – they occurred across all major primate lineages.”
INSUFFICIENT EVIDENCE
No evidence was provided in the search results to confirm or deny the specific finding regarding great apes versus other primate lineages.
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Claim 9: “Japanese macaques grooming and riding on the backs of sika deer.”
DISPUTED
While the claim mentions grooming and riding, the provided evidence focuses heavily on 'sexual in nature' mounting behaviors between Japanese macaques and sika deer, rather than grooming/riding.
travel_explore
web search NEUTRAL — Direct interactions between Japanese macaques and Sika deer provide a compelling example of the evolution of interspecies relationships. Initially, these species coexisted closely in terms of spatial …
https://hal.science/hal-05075485v1/document
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web search NEUTRAL — Researchers witnessed adolescent female Japanese macaques mounting sika deer in ways that were "sexual in nature." They have several theories for why but say more research is necessary.
https://www.npr.org/sections/thetwo-way/2017/12/15/571175252…
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web search NEUTRAL — MINOO, JAPAN — When Japanese male macaques were spotted mounting female Sika deer back in January, some passed it off as misdirected mating.But when it becam...
https://www.youtube.com/watch?v=EjyWa3yKmK4
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.