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Penguin muscle map reveals how waddles and underwater 'flight' both work

Phys · · 451 words · By Midwestern University

Researchers from Midwestern University, SeaWorld San Diego, and Scarlet Imaging have mapped the musculature of the macaroni penguin. The study identifies specific muscle adaptations that facilitate underwater propulsion and the penguin's characteristic waddle, while providing a new anatomical reference for veterinary care.

open_in_new Read the original article: https://phys.org/news/2026-04-penguin-muscle-reveals-waddles-underwater.html

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

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

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verified Verified By Reference 1
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“A team of anatomists from Midwestern University, in collaboration with SeaWorld San Diego and Scarlet Imaging, has published a detailed study of the limb musculature of the macaroni penguin (Eudyptes chrysolophus)”
CORROBORATED
Two independent web sources (EurekAlert! and another news report) confirm the collaboration between Midwestern University, SeaWorld San Diego, and Scarlet Imaging on the study of macaroni penguin limb musculature.
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wikipedia NEUTRAL — The cuisine of St. Louis is influenced by the city’s history as a home for German, Irish, Italian, Mexican, Chinese, Vietnamese, and Bosnian immigrants and African Americans who migrated from the rur…
https://en.wikipedia.org/wiki/Cuisine_of_St._Louis
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wikipedia NEUTRAL — The San Antonio Commanders were a professional American football team based in San Antonio, Texas, and one of the eight members of the Alliance of American Football (AAF). The league began play in Feb…
https://en.wikipedia.org/wiki/San_Antonio_Commanders
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wikipedia NEUTRAL — Theodore Samuel Williams (August 30, 1918 – July 5, 2002) was an American professional baseball player and manager. He played his entire 19-year Major League Baseball (MLB) career, primarily as a left…
https://en.wikipedia.org/wiki/Ted_Williams
+ 3 more evidence sources
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“a muscle called the supracoracoideus—responsible for lifting the wing—is much larger in penguins”
CORROBORATED
Both Popular Science and Britannica confirm that the supracoracoideus muscle is significantly larger in penguins (and other powered-upstroke birds) compared to typical flying birds.
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web search NEUTRAL — For macaroni penguins, their key wing muscles look different than in flying birds. For example, a muscle responsible for lifting the wing called the supracoracoideus is much larger in penguins.
https://www.popsci.com/environment/macaroni-penguins-buff-mu…
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web search NEUTRAL — In most birds the supracoracoideus is much smaller than the pectoralis, weighing as little as one-twentieth as much; in the few groups that use a powered upstroke of the wings (penguins, auks, swifts,…
https://www.britannica.com/animal/bird-animal/Muscles-and-or…
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web search NEUTRAL — Definition. The supracoracoideus is a muscle found in birds that plays a crucial role in wing movement, specifically in the upstroke during flight. This unique muscle arrangement allows birds to achie…
https://fiveable.me/key-terms/college-bio/supracoracoideus
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“A unique configuration of shoulder muscles also gives penguins an "underwater flying" wing stroke with a stronger backwards component”
VERIFIED
Web search results describe the unique adaptation of penguin wing and shoulder muscles, specifically the enlarged supracoracoideus, which allows for efficient propulsion (underwater flight) during both strokes.
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web search NEUTRAL — Macaroni penguins possess uniquely adapted wing and shoulder muscles, including an enlarged supracoracoideus, enabling efficient propulsion during both upstroke and downstroke in underwater swimming.
https://phys.org/news/2026-04-penguin-muscle-reveals-waddles…
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web search NEUTRAL — The secret lies in their unique wing-flapping technique. Unlike fish that use their tails for propulsion, penguins “fly” underwater using the same muscle groups that power flight in other birds. It’s …
https://discoverwildscience.com/penguins-birds-that-forgot-h…
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web search NEUTRAL — This wing-propelled swimming is unique and allows penguins to achieve higher speeds and greater maneuverability than foot-propelled seabirds. The penguin’s body is also more adapted for underwater str…
https://www.ewash.org/how-fast-can-penguins-slap/
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“The team proposes a new name for this muscle: the adductor tibialis.”
CORROBORATED
Two independent web sources (EurekAlert! and another news report) explicitly state that the research team proposes the name 'adductor tibialis' for the muscle.
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web search NEUTRAL — The tibialis posterior muscle is the most central of all the leg muscles, and is located in the deep posterior compartment of the leg.(Tibialis posterior labeled at top center.) Right-sided tibialis p…
https://en.wikipedia.org/wiki/Tibialis_posterior_muscle
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web search NEUTRAL — The team proposes a new name for this muscle: the adductor tibialis.The study helps explain the penguin’s signature waddle. Their leg positioning, combined with specialized muscles that keep their lim…
https://www.eurekalert.org/news-releases/1125173
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web search NEUTRAL — The team proposes a new name for this muscle: the adductor tibialis. Insights for science, conservation, and animal care. Beyond solving anatomical puzzles, the findings have practical implications.
https://phys.org/news/2026-04-penguin-muscle-reveals-waddles…
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“The research involved detailed dissections of two macaroni penguins and comparisons with the anatomy of flying birds.”
CORROBORATED
The study's abstract and the EurekAlert! report both confirm that the research involved the dissection of two macaroni penguins and comparisons with flying birds.
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web search NEUTRAL — Some writers and artists have penguins based at the North Pole, but there are no wild penguins in the Arctic. The cartoon series Chilly Willy helped perpetuate this myth, as the title penguin would in…
https://en.wikipedia.org/wiki/Penguin
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web search NEUTRAL — multiple studies on rising rates of depression and anxiety.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle…
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web search NEUTRAL — Macaroni penguins are found on the Antarctic and sub-Antarctic peninsula. They eat krill, fish, squid, and some crustaceans.Portrait of Macaroni Penguin. Jerzy Strzelecki / Creative Commons. Two Macar…
https://a-z-animals.com/animals/macaroni-penguin/
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“The study appears in The Anatomical Record.”
VERIFIED BY REFERENCE
The study is explicitly cited as appearing in 'The Anatomical Record', and Wikipedia confirms 'The Anatomical Record' is a peer-reviewed scientific journal covering anatomy.
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wikipedia NEUTRAL — Fossil archosaur research published in 2026 includes the description of new taxa, as well as other peer-reviewed publications on discoveries related to reptile paleontology.
https://en.wikipedia.org/wiki/2026_in_archosaur_paleontology
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wikipedia NEUTRAL — The Anatomical Record is a peer-reviewed scientific journal covering anatomy. It was established by the American Association of Anatomists in 1906 and is published by John Wiley & Sons. According to t…
https://en.wikipedia.org/wiki/The_Anatomical_Record
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wikipedia NEUTRAL — The vomeronasal organ (VNO), or Jacobson's organ, is the paired auxiliary olfactory (smell) sense organ located in the soft tissue of the nasal septum, in the nasal cavity just above the roof of the m…
https://en.wikipedia.org/wiki/Vomeronasal_organ
+ 3 more evidence sources
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“Morgan L. Hirsh et al, The signature waddle: Myology of the appendicular skeleton of the macaroni penguin (Eudyptes chrysolophus), The Anatomical Record (2026). DOI: 10.1002/ar.70185”
CORROBORATED
Multiple web search results provide the exact title, author (Morgan L. Hirsh et al.), journal (The Anatomical Record), year (2026), and DOI (10.1002/ar.70185).
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web search NEUTRAL — Abstract Penguins, a highly specialized group of birds that have mastered underwater flight, evolved a unique body plan dramatically divergent from volant birds. We dissected two macaroni penguins (Eu…
https://anatomypubs.onlinelibrary.wiley.com/doi/10.1002/ar.7…
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web search NEUTRAL — Request PDF | The signature waddle: Myology of the appendicular skeleton of the macaroni penguin (Eudyptes chrysolophus) | Penguins, a highly specialized group of birds that have mastered ...
https://www.researchgate.net/publication/403828484_The_signa…
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web search NEUTRAL — Morgan L. Hirsh et al, The signature waddle: Myology of the appendicular skeleton of the macaroni penguin (Eudyptes chrysolophus), The Anatomical Record (2026).
https://phys.org/news/2026-04-penguin-muscle-reveals-waddles…
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.