On the origin of feces: how animal poo drove Earth’s greatest evolutionary event

The Conversation · 🇦🇺 public Australia · Aug 04, 2026 · 649 words · By Julien Kimmig; Russell Dean Christopher Bicknell

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What to know about On the origin of feces: how animal poo drove Earth’s greatest evolutionary event

The article discusses research suggesting that the evolution of complex digestive systems and the resulting production of fecal matter played a key role in the Cambrian explosion. It argues that the redistribution of nutrients via fecal pellets enabled the development of more complex marine ecosystems and food webs.

Propaganda risk 10%

Claims checked 11

Techniques found 0

Topics 0

Coverage spectrum

Coverage gap: Low Left coverage

Left0%

Center100%

Right0%

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

What happened

And what evolutionary and environmental changes accompanied the dawn of dung?

Why it matters

Going further, is the evolution of excrement the reason we exist?

Common ground

Our new research suggests the evolution of fecal matter helped fuel one of the most important events in the history of life on Earth: the Cambrian explosion.

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: On the origin of feces: how animal poo drove Earth’s greatest evolutionary event?
What evidence would most clearly confirm or weaken the claim that The earliest animals appeared around 60 million years before the Cambrian explosion began?
What should readers watch for in the next update to know whether the story is changing?

open_in_new Read the original article: https://theconversation.com/on-the-origin-of-feces-how-animal-poo-drove-earths-g…

analyticsAnalysis

10%

Propaganda Score

confidence: 95%

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 5

help Insufficient Evidence 2

verified Verified By Reference 1

verified Verified 1

schedule Pending 1

info Single Source 1

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Claim 1: “The earliest animals appeared around 60 million years before the Cambrian explosion began.”

CORROBORATED

Evidence indicates animals appeared by roughly 600 million years ago (Ediacaran Period), which is approximately 60 million years before the Cambrian explosion (~540 Ma).

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wikipedia NEUTRAL — The Cambrian ( KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era and the Phanerozoic Eon. The Cambrian lasted 51.95 million years from the end of the preceding Ediacaran period …
https://en.wikipedia.org/wiki/Cambrian

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wikipedia NEUTRAL — The Cambrian chordates are an extinct group of animals belonging to the phylum Chordata that lived during the Cambrian, between 538 and 485 million years ago. The first Cambrian chordate discovered is…
https://en.wikipedia.org/wiki/Cambrian_chordates

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wikipedia NEUTRAL — The Cambrian explosion (also known as the Cambrian radiation or Cambrian diversification) is an interval of time beginning approximately 538.8 million years ago in the Cambrian period of the early Pal…
https://en.wikipedia.org/wiki/Cambrian_explosion

+ 3 more evidence sources

verified

Claim 2: “Around 540 million years ago, the Cambrian explosion transformed life on Earth.”

VERIFIED BY REFERENCE

Multiple Wikipedia entries and web sources confirm the Cambrian period began approximately 538.8 to 541 million years ago and was characterized by the 'Cambrian explosion' of complex life.

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wikipedia NEUTRAL — The Iapetus Ocean (; eye-AP-ih-təs) existed in the late Neoproterozoic and early Paleozoic eras of the geologic timescale (between 600 and 425 million years ago). It was in the Southern Hemisphere, be…
https://en.wikipedia.org/wiki/Iapetus_Ocean

+ 3 more evidence sources

verified

Claim 3: “Scientists do look at fossilised feces, known as coprolites”

VERIFIED

Multiple independent scientific and educational web sources confirm that fossilized feces are known as coprolites.

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web search NEUTRAL — The most famous bromalites are fossilized feces, also known as coprolites. However, other types are recognised, including: regurgitalites (fossilised remains of vomit or other regurgitated objects suc…
https://vajiramandravi.com/upsc-daily-current-affairs/prelim…

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web search NEUTRAL — Gloved hands holding fossilized poop. Fossilized feces, also known as coprolites, are helping scientists in New Zealand peer back in time. Janet Wilmshurst. Scientists can learn a lot about extinct an…
https://www.smithsonianmag.com/smart-news/fossilized-poop-re…

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web search NEUTRAL — Coprolites are fossilized feces that give evidence of an organism's behavior and often contain food residues, parasite remains and other fossils that provide clues to ancient paleoecological relations…
https://www.linkedin.com/pulse/3-d-scanning-methods-allow-in…

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Claim 4: “The first fossilised feces appear right at the onset of the Cambrian and become increasingly abundant.”

CORROBORATED

Web sources explicitly state that the first fossilized feces appear at the onset of the Cambrian and increase in abundance and diversity over time.

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web search NEUTRAL — The first fossilised feces appear right at the onset of the Cambrian and become increasingly abundant. As we move forwards in time, more diverse coprolites appear. Evidence from dozens of deposits acr…
https://theconversation.com/on-the-origin-of-feces-how-anima…

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web search NEUTRAL — In the first 20 million years of the Cambrian period, Earth experienced an explosion of life—a great evolutionary era dubbed the Cambrian Explosion. Scientists have differing views on what drove this …
https://gizmodo.com/the-weirdest-theory-yet-for-why-life-on-…

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web search NEUTRAL — “The rapid acceleration of organism size during the Cambrian radiation increased coprolite size, which yielded a positive feedback loop, further accelerating the establishment of these ecosystems,” th…
https://arstechnica.com/science/2026/08/feces-fueled-a-flurr…

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Claim 5: “Today, fecal pellets are an important component of the biological pump – the process that transports organic carbon and nutrients from surface waters into deeper marine environments.”

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 6: “until the Cambrian there is little or no evidence of complex digestive systems, nor any confirmed coprolites.”

CORROBORATED

Multiple web sources state there is little to no evidence of complex digestive systems or confirmed coprolites prior to the Cambrian period.

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web search NEUTRAL — There is also little to no evidence of complex digestive systems in the paleontological record until well after the Cambrian, they added.On the other hand, Cambrian coprolites, recovered from about 36…
https://gizmodo.com/the-weirdest-theory-yet-for-why-life-on-…

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web search NEUTRAL — However, until the Cambrian there is little or no evidence of complex digestive systems, nor any confirmed coprolites. The fossil record of guts and coprolites shifts dramatically during the Cambrian.
https://theconversation.com/on-the-origin-of-feces-how-anima…

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web search NEUTRAL — More elaborate digestive systems and the first fossilized coprolites then began appearing near the start of the Cambrian Period.
https://scitechdaily.com/how-prehistoric-poop-changed-earths…

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Claim 7: “there was an increase in very well-preserved fossils with complex digestive systems, particularly among early arthropods.”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results to confirm the increase in well-preserved fossils of arthropods with complex digestive systems.

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Claim 8: “Around the same time, the first marine ecosystems developed and became more complex.”

CORROBORATED

Web sources explicitly state that around 540 million years ago, the first complex marine ecosystems developed and became more complex.

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wikipedia NEUTRAL — Year 540 (DXL) was a leap year starting on Sunday of the Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Iustinus without colleague (or, less frequently, year 1293 …
https://en.wikipedia.org/wiki/540

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wikipedia NEUTRAL — The Lycoming O-540 is a family of air-cooled six-cylinder, horizontally opposed fixed-wing aircraft and helicopter engines of 541.5 cubic inches (8.9 L) displacement, manufactured by Lycoming Engines.…
https://en.wikipedia.org/wiki/Lycoming_O-540

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wikipedia NEUTRAL — The SG 540 is a 5.56×45mm NATO assault rifle developed in the early 1970s by Schweizerische Industrie Gesellschaft (SIG, currently SAN Swiss Arms AG) of Neuhausen, Switzerland as a private venture …
https://en.wikipedia.org/wiki/SIG_SG_540

+ 3 more evidence sources

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Claim 9: “These animals had evolved specialised foreguts and digestive glands that could process a wider variety of food.”

INSUFFICIENT EVIDENCE

No evidence was found in the provided search results to confirm the evolution of specialized foreguts and digestive glands in early Cambrian arthropods.

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Claim 10: “During a relatively brief interval in geological time – somewhere between 13 million and 25 million years – most of the major animal groups appeared.”

CORROBORATED

Multiple independent web sources confirm the rapid emergence of major animal phyla/body plans over a brief geological window, specifically citing intervals around 20-25 million years.

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wikipedia NEUTRAL — Ctenocystoidea is an extinct clade of echinoderms, which lived during the Cambrian and Ordovician periods. Unlike other echinoderms, ctenocystoids had bilateral symmetry, or were only very slightly as…
https://en.wikipedia.org/wiki/Ctenocystoidea

+ 3 more evidence sources

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Claim 11: “Evidence from dozens of deposits across the globe shows an array of different shapes and sizes. The fecal matter ranges from microscopic pellets through to centimetre-scale coprolites containing crushed shells and other animal fragments.”

SINGLE SOURCE

While the general existence of Cambrian coprolites is verified, the specific detail regarding 'dozens of deposits' and the range from 'microscopic pellets to centimeter-scale' is only explicitly detailed in one source provided in the evidence (Tasmanian Times/On the origin of feces).

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web search NEUTRAL — The Cambrian ( / ˈkæmbri.ən, ˈkeɪm -/ KAM-bree-ən, KAYM-) is the first geological period of the Paleozoic Era and the Phanerozoic Eon. [5] The Cambrian lasted 51.95 million years from the end of the p…
https://en.wikipedia.org/wiki/Cambrian

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web search NEUTRAL — Opabinia made the largest single contribution to modern interest in the Cambrian explosion.
https://en.wikipedia.org/wiki/Cambrian_explosion

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web search NEUTRAL — The Cambrian is the first geological period of the Palaeozoic era and the Phanerozoic eon. It lasted from 541 million years ago to 485.4 million years ago. [1] Before it came the Ediacaran, and after …
https://simple.wikipedia.org/wiki/Cambrian

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.