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Why did ‘Tyrannosaurus rex’ have such short arms?

The Conversation · · 1061 words · By Sarah Sheffield

A paleontologist explains the various scientific hypotheses regarding the function and evolutionary cause of the Tyrannosaurus rex's short arms. The article discusses possibilities such as social display, prey restraint, protection from other carnivores, or vestigiality, while noting that a definitive answer has not yet been reached.

open_in_new Read the original article: https://theconversation.com/why-did-tyrannosaurus-rex-have-such-short-arms-27343…

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0%
Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

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

schedule Pending 7
info Single Source 6
check_circle Corroborated 2
help Insufficient Evidence 2
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“the first skeleton was discovered in the early 1900s”
CORROBORATED
Multiple sources confirm the discovery of the first T. rex skeletons in the early 1900s, specifically citing 1900 and 1902 in Wyoming.
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web search NEUTRAL — Outdated skeletal restoration by William D. Matthew from 1905, published alongside Osborn's description paper. Barnum Brown, assistant curator of the American Museum of Natural History, found the firs…
https://en.wikipedia.org/wiki/Tyrannosaurus
travel_explore
web search NEUTRAL — Discovered in 1902 by the "Indiana Jones" of fossil hunters, the first Tyrannosaurus rex skeleton fascinated the public.In the early 1900s, dinosaur bones were like Egyptian mummies — mysteries that d…
https://www.npr.org/2011/09/14/140410442/bone-to-pick-first-…
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web search NEUTRAL — Facts about Tyrannosaurus rex and its discovery.The first known skeleton of a Tyrannosaurus rex was discovered later in 1900 in Wyoming, USA, followed by another in 1902.
https://www.nhm.ac.uk/discover/dino-directory/tyrannosaurus.…
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“T. rex, or King of the Tyrant Lizards, as its name translates”
CORROBORATED
Three independent authoritative sources (Wikipedia, National Geographic, and Smithsonian) all confirm the translation of Tyrannosaurus rex as 'King of the Tyrant Lizards'.
travel_explore
web search NEUTRAL — Osborn used the Latin word rex, meaning "king", for the specific name. The full binomial therefore translates to "tyrant lizard the king" or "King Tyrant Lizard", emphasizing the animal's size and pre…
https://en.wikipedia.org/wiki/Tyrannosaurus
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web search NEUTRAL — Why Tyrannosaurus rex was one of the fiercest predators of all time. Named the “king of the tyrant lizards,” T. rex was built to rule. Find out how these dinosaurs lived, what made them so vicious, an…
https://www.nationalgeographic.com/animals/facts/tyrannosaur…
travel_explore
web search NEUTRAL — What does the name “Tyrannosaurus rex” mean? “Tyrannosaurus” is Greek for “tyrant lizard,” and “rex” means “king” in Latin. So, Tyrannosaurus rex was “King of the Tyrant Lizards.” When and where did T…
https://www.si.edu/newsdesk/factsheets/tyrannosaurus-rex
info
“An adult T. rex was massive in size – approximately 40 feet (12 meters) long and 20 feet (6 meters) tall, weighing as much as an African elephant.”
SINGLE SOURCE
The provided evidence for this claim consists of dictionary definitions of the word 'adult' and does not contain any factual data regarding the size or weight of a T. rex.
travel_explore
web search NEUTRAL — In contrast to a non-adult or "minor", a legal adult is a person who has attained the age of majority and is therefore regarded as independent, self-sufficient, and responsible.
https://en.wikipedia.org/wiki/Adult
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web search NEUTRAL — The meaning of ADULT is fully developed and mature : grown-up. How to use adult in a sentence.
https://www.merriam-webster.com/dictionary/adult
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web search NEUTRAL — An adult under English law is someone over 18 years old. Adults pay an admission charge but children get in free.
https://dictionary.cambridge.org/us/dictionary/english/adult
info
“Each of its enormous sharp teeth could be near a foot (0.3 meters) in length from the root to the tip.”
SINGLE SOURCE
The evidence provided for this claim discusses T. rex arms or general dinosaur parts but does not provide the specific measurement of teeth being nearly a foot long from root to tip.
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web search NEUTRAL — The type species Tyrannosaurus rex (rex meaning 'king' in Latin), often shortened to T. rex or colloquially t-rex, is one of the best represented theropods. It lived throughout what is now western Nor…
https://en.wikipedia.org/wiki/Tyrannosaurus
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web search NEUTRAL — The biggest T. rex could measure 45 feet (14 meters) from the snout to the tip of the tail, but their arms were only about 3 feet (1 meter) long. On average, a T. rex’s arms were just about 30% of the…
https://www.thetelegraph.com/news/article/why-did-tyrannosau…
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web search NEUTRAL — What if you woke up one morning and you had sprouted a dinosaur body part overnight? From a Velociraptor's sharp sickle-tipped toes to a T. rex's giant curve...
https://www.youtube.com/watch?v=hu7ZyV_9AE0
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“T.rex, which went extinct just over 65 million years ago.”
SINGLE SOURCE
The provided evidence discusses the popularity and general description of T. rex but does not explicitly state the extinction date as 'just over 65 million years ago'.
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web search NEUTRAL — Tyrannosaurus has been one of the best-known dinosaurs since the early 20th century. Science writer Riley Black has called it the "ultimate dinosaur". Its fossils have been a popular attraction in mus…
https://en.wikipedia.org/wiki/Tyrannosaurus
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web search NEUTRAL — May 4, 2026 · Tyrannosaurus rex is the best-known and largest member of a group of theropod dinosaurs called tyrannosaurs; its scientific name is Latin for “king of the tyrant lizards.”
https://www.britannica.com/animal/Tyrannosaurus-rex
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web search NEUTRAL — May 13, 2025 · Tyrannosaurus rex is by far the most popular dinosaur, having spawned a huge number of books, movies, TV shows, and video games. What's truly amazing, though, is that some popular T-rex…
https://www.thoughtco.com/things-to-know-tyrannosaurus-10938…
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“The biggest T. rex could measure 45 feet (14 meters) from the snout to the tip of the tail, but their arms were only about 3 feet (1 meter) long.”
SINGLE SOURCE
The specific measurements (45 feet long, 3 feet arms) are found in one web search result ('Why did ‘Tyrannosaurus rex’ have such short arms?'), but the other provided evidence for this claim is irrelevant (city sizes and dictionary definitions).
travel_explore
web search NEUTRAL — The Chinese municipality of Chongqing, which is the largest city proper in the world by population, comprises a huge administrative area of 82,403 km 2, around the size of Austria.
https://en.m.wikipedia.org/wiki/List_of_largest_cities
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web search NEUTRAL — What are the Biggest Statues in the World?
https://largest.org/
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web search NEUTRAL — The meaning of LARGE is exceeding most other things of like kind especially in quantity or size : big. How to use large in a sentence.
https://www.merriam-webster.com/dictionary/largest
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“On average, a T. rex’s arms were just about 30% of the length of its legs.”
SINGLE SOURCE
The claim that arms were 30% of the length of the legs is mentioned in one specific web result, while other evidence provided for this claim is irrelevant (alphabet/letter T).
travel_explore
web search NEUTRAL — T (minuscule: t) is the twentieth letter of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide.
https://en.m.wikipedia.org/wiki/T
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web search NEUTRAL — Apr 27, 2026 · T’s annual Greats Issue profiles three artists united in their dedication to taking risks: the actress Glenn Close, the rapper Tyler, the Creator and the playwright David Henry Hwang. R…
https://www.facebook.com/tmagazine/
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web search NEUTRAL — Jul 21, 2015 · We're proud to present the twentieth one: the letter T. Look out for the rest of the alphabet following soon!
https://m.youtube.com/watch?v=KlN7w90utho
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“humans have, on average, arms around 66% of the length of their legs.”
SINGLE SOURCE
The evidence provided discusses human anatomy and fitness guides but does not provide the specific statistical average that human arms are 66% of the length of their legs.
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web search NEUTRAL — In human anatomy, the arm refers to the upper limb in common usage, although academically the term specifically means the upper arm between the glenohumeral joint and the elbow joint. The distal part …
https://en.wikipedia.org/wiki/Arm
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web search NEUTRAL — Explore the real data on average arm length by height. Our guide uses validated research, data tables, and practical insights for trainers and clinicians.
https://www.cartwrightfitness.co.uk/average-arm-length-by-he…
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web search NEUTRAL — This is the final episode of the Lean Arms Challenge! This workout will really work those arms of yours and it's all standing exercises and low impact so it'...
https://www.youtube.com/watch?v=j64BBgBGNIU
help
“The evolutionary trend toward shorter arms in theropods – the larger group of meat-eating, two-legged dinosaurs that T. rex belongs to – happened multiple times.”
INSUFFICIENT EVIDENCE
No evidence was found after searching for this claim.
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“earlier relatives had proportionally longer arms”
INSUFFICIENT EVIDENCE
No evidence was found after searching for this claim.
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“T. rex was a successful carnivorous species that existed for over a million years.”
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“They only went extinct when an asteroid hit the Earth, causing a global mass extinction.”
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“male and female T. rex skeletons don’t show the major differences that paleontologists would take as clues that they relied on social displays to attract mates.”
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“the arms served little or no purpose at all, so over time, they became vestigial.”
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“One example is a whale’s hindlimbs. Whales evolved from mammals that lived on land that had large legs to move around. The bones are still present in today’s whales, but have gotten much smaller over millions of years and have no function.”
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“the fossil record reveals that arms got shorter as theropod skulls got larger across many different dinosaur groups, including T. rex.”
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“Researchers can use mathematical equations to accurately predict theropod arm length if they know the animal’s skull size and length of its upper leg bone, the femur.”
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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.