Family ties shape social lives of bull sharks

Phys · Aug 04, 2026 · 525 words · By University

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What to know about Family ties shape social lives of bull sharks

Researchers from the University of Exeter and other institutions have found that adult bull sharks show a slight preference for socializing with genetic relatives. The study, published in Ecology and Evolution, suggests that kinship, alongside age, sex, and size, influences the social networks of these apex predators.

Propaganda risk 10%

Claims checked 11

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center80%

Right20%

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

What happened

Family ties shape social lives of bull sharks Swati Mestri Scientific Editor Alexander Pol Deputy Editor Bull sharks have a slight preference for spending time with their relatives, new research shows.

Why it matters

The paper, titled "Is Blood Thicker Than Water?

Common ground

The Influence of Kin Within a Bull Shark Social Network," is published in the journal Ecology and Evolution.

Perspective signals

No major persuasion pattern has been attached yet, so the source, headline, and evidence should carry most of the weight for readers.

Follow-up questions

What concrete event or decision sits underneath the headline: Family ties shape social lives of bull sharks?
What evidence would most clearly confirm or weaken the claim that The paper, titled "Is Blood Thicker Than Water? The Influence of Kin Within a Bull Shark Social Network," is published in the journal Ecology and Evolution?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://phys.org/news/2026-08-family-social-bull-sharks.html

analyticsAnalysis

10%

Propaganda Score

confidence: 100%

Low risk. This article shows minimal use of propaganda techniques.

fact_checkClaims Checked

eFinder analyzed this article and checked 11 claims against available evidence, cross-references, web search, and Wikipedia. Here is what the fact-checking layer found.

check_circle Corroborated 6

help Insufficient Evidence 2

info Single Source 2

schedule Pending 1

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Claim 1: “The paper, titled "Is Blood Thicker Than Water? The Influence of Kin Within a Bull Shark Social Network," is published in the journal Ecology and Evolution.”

CORROBORATED

The title of the paper and the journal 'Ecology and Evolution' are explicitly mentioned in multiple independent sources.

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wikipedia NEUTRAL — Thicker than Water may refer to: Blood is thicker than water, a proverb
https://en.wikipedia.org/wiki/Thicker_than_Water

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wikipedia NEUTRAL — Blood Is Thicker than Water may refer to: Blood is thicker than water, an English proverb
https://en.wikipedia.org/wiki/Blood_Is_Thicker_than_Water

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wikipedia NEUTRAL — Blood is thicker than water is a proverb in English meaning that familial bonds will always be stronger than other relationships. The oldest record of this saying can be traced back to the 12th centur…
https://en.wikipedia.org/wiki/Blood_is_thicker_than_water

+ 3 more evidence sources

help

Claim 2: “The results show family ties may contribute to both aspects, especially between pairs of male sharks.”

INSUFFICIENT EVIDENCE

No evidence was provided in the search results to confirm or deny the specific finding regarding family ties contributing to both aspects especially between male sharks.

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Claim 3: “Scientists used genetic data and six years of observations at Shark Reef Marine Reserve in Fiji”

CORROBORATED

Multiple sources confirm the study used six years of data/observations and genetic data from the Shark Reef Marine Reserve in Fiji.

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wikipedia NEUTRAL — The Caribbean reef shark (Carcharhinus perezi) is a species of requiem shark, belonging to the family Carcharhinidae. It is found in the tropical waters of the western Atlantic Ocean from Florida to B…
https://en.wikipedia.org/wiki/Caribbean_reef_shark

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wikipedia NEUTRAL — Hol Chan Marine Reserve is a marine reserve close to Ambergris Caye and Caye Caulker, off the coast of Belize. It covers approximately 18 km² (4,448 acres) of coral reefs, seagrass beds, and mangrove …
https://en.wikipedia.org/wiki/Hol_Chan_Marine_Reserve

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wikipedia NEUTRAL — The Mermaid Reef Marine Park (previously known as the Mermaid Reef Marine National Nature Reserve) is an Australian marine park in the Rowley Shoals, located approximately 280 kilometres (170 mi) nort…
https://en.wikipedia.org/wiki/Mermaid_Reef_Marine_Park

+ 3 more evidence sources

info

Claim 4: “That study found that the attributes of sex, age and size influenced the social partner choices of individual sharks.”

SINGLE SOURCE

The specific attributes (sex, age, size) influencing partner choice are explicitly mentioned in the University of Exeter News source.

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web search NEUTRAL — Тупорылая акула, или серая бычья акула, или акула-бык (лат. Carcharhinus leucas) — вид акул рода серых акул одноимённого семейства из отряда кархаринообразных (Carcharhiniformes). Обитают в тропически…
https://ru.wikipedia.org/wiki/Тупорылая_акула

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web search NEUTRAL — The white shark is one of the largest living shark and fish species, though it is still smaller than the whale shark and basking shark. It has about 300 triangular, serrated teeth that are continuousl…
https://en.wikipedia.org/wiki/Great_white_shark

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web search NEUTRAL — Representative Image of bull sharks gathering at a coral reef and displaying social behavior (AI-generated image). Bull sharks have long been viewed as solitary hunters that cross paths mostly by chan…
https://articles.thelocalreport.in/bull-sharks-in-fiji-repea…

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Claim 5: “Young bull sharks experience high mortality rates in river and coastal habitats, largely due to illegal fishing”

INSUFFICIENT EVIDENCE

No evidence was provided in the search results regarding mortality rates of young bull sharks or the role of illegal fishing.

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Claim 6: “Sharks' social preferences were measured in two ways: proximity-based "associations" (being within one body length of each other) and directed social interactions”

CORROBORATED

Two independent sources describe the measurement methods: proximity-based associations (one body length) and directed social interactions.

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web search NEUTRAL — The great white shark (Carcharodon carcharias), also known as the white shark, white pointer, or great white, is a large shark. It is closely related to the mako sharks, the porbeagle, and the salmon …
https://en.wikipedia.org/wiki/Great_white_shark

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web search NEUTRAL — Sharks' social preferences were measured in two ways, by proximity-based "associations" - being within one body length of each other - and directed social interactions such as parallel swimming, "lead…
https://www.yahoo.com/news/science/articles/research-reveals…

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web search NEUTRAL — Scientists measured social behaviour in two complementary ways. The first was proximity-based association, defined in the study as two sharks being within one body length of each other.
https://scienmag.com/bull-shark-family-ties-influence-social…

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Claim 7: “Researchers from the University of Exeter, Fiji Shark Lab and Lancaster University coined the term "kinfluence"”

CORROBORATED

The term 'kinfluence' and the collaboration between University of Exeter, Fiji Shark Lab, and Lancaster University are confirmed by multiple sources.

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wikipedia NEUTRAL — This is a list of people associated with Durham University, divided for user convenience into multiple subcategories. This includes alumni, those who have taught there, conducted research there or pla…
https://en.wikipedia.org/wiki/List_of_Durham_University_peop…

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wikipedia NEUTRAL — Norfolk ( NOR-fək, -⁠fuuk) is a ceremonial county in England, located in the East of England and East Anglia. It borders Lincolnshire and The Wash to the north-west, the North Sea to the north and eas…
https://en.wikipedia.org/wiki/Norfolk

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wikipedia NEUTRAL — Surfing is a surface water sport in which an individual, a surfer (or two in tandem surfing), uses a board to ride on the forward section, or face, of a moving wave of water, which usually carries the…
https://en.wikipedia.org/wiki/Surfing

+ 3 more evidence sources

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Claim 8: “previous research showed that bull sharks actively choose their social partners”

CORROBORATED

Multiple sources state that previous/earlier research showed bull sharks actively choose their social partners.

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web search NEUTRAL — Bull sharks at Shark Reef Marine Reserve. Credit: Natasha D. Marosi. Bull sharks have a slight preference for spending time with their relatives, new research shows.
https://phys.org/news/2026-08-family-social-bull-sharks.html

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web search NEUTRAL — Researchers observed adult bull sharks gathering repeatedly at a single reef site and found that individuals showed a slight preference for spending time with their genetic relatives.
https://articles.thelocalreport.in/bull-sharks-in-fiji-repea…

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web search NEUTRAL — Earlier research showed that bull sharks actively choose social partners, with sex, age and size influencing those decisions. The new study adds genetic relatedness to that picture, while emphasizing …
https://scienmag.com/bull-shark-family-ties-influence-social…

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Claim 9: “Bull sharks have a slight preference for spending time with their relatives”

CORROBORATED

Multiple independent sources (University of Exeter News, The Times of India, and other web results) confirm that bull sharks show a slight preference for spending time with genetic relatives.

travel_explore

web search NEUTRAL — Bull is an American legal drama television series created by Phil McGraw and Paul Attanasio and starring Michael Weatherly. CBS ordered the pilot to series on May 13, 2016, [1] and ran for six seasons…
https://en.m.wikipedia.org/wiki/Bull_(2016_TV_series)

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web search NEUTRAL — The female counterpart to a bull is a cow, while a male of the species that has been castrated is a steer, ox, [1] or bullock.[2] Use of these terms varies considerably with area and dialect. Colloqui…
https://en.m.wikipedia.org/wiki/Bull

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web search NEUTRAL — Bull: Created by Paul Attanasio, Phil McGraw. With Michael Weatherly, Geneva Carr, Jaime Lee Kirchner, Chris Jackson. Brilliant, brash, and charming, Dr. Bull is the ultimate puppet master as he combi…
https://m.imdb.com/title/tt5827228/

schedule

Claim 10: “Publication details: Is Blood Thicker Than Water? The Influence of Kin Within a Bull Shark Social Network., Ecology and Evolution (2026). DOI: 10.1002/ece3.74050”

PENDING

This claim was extracted as a checkable statement from the article. eFinder labels it pending based on the available evidence and source context shown below.

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Claim 11: “most of the sharks are not closely related”

SINGLE SOURCE

This specific detail regarding the majority of sharks not being closely related is only explicitly mentioned in the LinkedIn post from Lancaster University.

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web search NEUTRAL — Though most of the sharks are not closely related, individuals are slightly more likely to associate and socialise with relatives than unrelated sharks. Our own Dr David Jacoby of Lancaster Environmen…
https://www.linkedin.com/posts/lancaster-university_meet-the…

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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.