The Strongest Animals by Relative Strength: Beetles, Ants, and the Science of Scaling
Photo: Alina Vilchenko / Pexels
A horned dung beetle (Onthophagus taurus) no longer than a fingernail can pull a load 1,141 times its own body weight. Scaled to a 70 kg adult human, that would mean pulling two fully loaded 18-wheel trucks — a combined weight of roughly 80 tonnes — using nothing but leg strength on a flat surface. The number is real, measured in a controlled lab experiment at Queen Mary University of London in 2010. But it is not a miracle of beetle evolution: it is an inevitable consequence of a mathematical relationship between size and strength that has been understood since the 17th century. Small animals are always relatively stronger than large ones, and the physics that explains this also explains why insects will never grow to the size of humans, why elephants can't jump, and why the world's strongest living things, pound for pound, are mostly creatures most people can barely see.
The Square-Cube Law: Why Size Changes Everything
The physical foundation for understanding relative strength is the square-cube law, first articulated by Galileo Galilei in his 1638 Two New Sciences. The principle is simple: when a shape is scaled up uniformly by a linear factor, its surface area grows as the square of that factor while its volume (and therefore mass) grows as the cube.
Square-cube law — a mathematical relationship stating that as the linear dimensions of an object scale by a factor n, its cross-sectional area scales by n² and its volume by n³. Applied to biology: muscle strength is proportional to the cross-sectional area of muscle fibers (n²), while body mass is proportional to volume (n³). A tenfold increase in body length produces only a hundredfold increase in strength but a thousandfold increase in body weight.
The practical implication: a dung beetle scaled up to human size would not be proportionally as strong as the small version. If you increased its linear dimensions by 1,000 times (from roughly 1 cm to 10 m), its muscle cross-sectional area would increase by 1,000² = 1 million times, but its weight would increase by 1,000³ = 1 billion times. At that scale, the beetle's muscles would not even be strong enough to support its own skeleton, let alone pull anything. This is why elephants, the largest land animals, cannot jump: the forces required to accelerate several tonnes upward exceed what bone and tendon can withstand, regardless of muscle power.
Think of it like a bridge: a toothpick bridge can hold a disproportionate amount of weight relative to its own mass, but the world's heaviest-loading bridges require steel and concrete — not because small materials are stronger per unit, but because the loads they must support scale with size much faster than structural cross-sections can keep up.
Source: Galilei, G. (1638), Discorsi e Dimostrazioni Matematiche intorno a Due Nuove Scienze — the original statement of the geometric scaling argument for biological limits on size and strength. Translation: Drake, S. (1974), University of Wisconsin Press.
Source: Schmidt-Nielsen, K. (1984), Scaling: Why Is Animal Size So Important?, Cambridge University Press — the standard reference for biological scaling laws, metabolic scaling, and the relationship between body size and structural performance in animals.
The Record Holders: Ranked by Relative Strength
Measuring relative strength requires a standardized metric: load carried or pulled as a multiple of the animal's own body weight. Different studies use different protocols — pulling loads, lifting loads, or measuring maximum force generation against a strain gauge — which creates some difficulty in direct comparison. The figures below reflect the best-documented measurements from published research.
| Rank | Animal | Relative Strength | Measurement Type | Source |
|---|---|---|---|---|
| 1 | Archegozetes longisetosus (mite) | ~1,150× body weight | Pull force on strain gauge | Heethoff & Koerner, 2007 |
| 2 | Horned dung beetle (Onthophagus taurus) | 1,141× body weight | Pull force, cotton thread/pulley | Knell & Simmons, 2010 |
| 3 | Rhinoceros beetle (Dynastes hercules) | ~850× body weight | Load-carrying estimate | Various |
| 4 | Leafcutter ant (Atta sp.) | ~50× body weight (load carried) | Field and lab carrying | Burd et al., 2010 |
| 5 | Leafcutter ant neck joint | ~3,000–5,000× body weight | Static structural failure point | Nguyen et al., 2014 |
| 6 | Gorilla | ~6–10× body weight | Lifting / climbing force estimates | Various |
| 7 | Human (trained powerlifter) | ~2–3× body weight | Olympic/competition lift | Various |
| 8 | Elephant | ~0.25× body weight (trunk lifting) | Direct measurement | Various |
Source: Heethoff, M. and Koerner, L. (2007), "Small but powerful: the oribatid mite Archegozetes longisetosus Aoki (Acari, Oribatida) produces disproportionately high forces," Journal of Experimental Biology, Vol. 210 — pull-force measurements on the mite finding forces 1,150 times body weight, five times higher than predicted by allometric scaling.
Source: Knell, R.J. and Simmons, L.W. (2010), "Mating tactics determine patterns of sexual selection in a dimorphic beetle," Proceedings of the Royal Society B, Vol. 277 — the study containing the dung beetle pulling-strength measurements of 1,141× body weight.
The Horned Dung Beetle: Competition-Driven Strength
The horned dung beetle Onthophagus taurus holds the record for the strongest insect by relative pulling strength, at 1,141 times its own body weight. What makes this figure unusual is not just its magnitude — it is the explanation for why this particular beetle evolved such extreme strength.
Dung beetle males dig tunnels in dung piles, and females lay eggs in these tunnels. Access to tunnels determines reproductive success: males that can control tunnel entrances mate with females inside. When a rival male attempts to enter an occupied tunnel, the resident male braces his legs against the tunnel walls and pulls backward against the intruder. The outcome of this contest determines who reproduces.
The strength measurement was made by attaching a cotton thread to the beetle's wing cases (elytra), running the thread over a pulley, and adding measured weights to the end until the beetle could no longer maintain position. The 1,141× figure represents the maximum weight at which the beetle still held its ground — genuinely a tug-of-war measurement, directly modeling the natural context in which this strength evolved.
Critically, male Onthophagus taurus beetles come in two distinct morphs: large-horned males that hold tunnels and fight directly, and small hornless males that use sneaking strategies — entering tunnels from alternate approaches to mate while the tunnel owner is otherwise engaged. Biologist Rob Knell and Leigh Simmons found that the large-horned, fighting males are significantly stronger for their size than the hornless males, confirming that the strength record is specifically the product of sexual selection pressure on males that fight for tunnel access.
Source: Moczek, A.P. and Emlen, D.J. (2000), "Male horn dimorphism in the scarab beetle, Onthophagus taurus: do alternative reproductive tactics favour alternative phenotypes?" Animal Behaviour, Vol. 59 — the foundational study of the two male morphs in O. taurus and the fitness consequences of each reproductive strategy.
The Mite That Beats the Beetle: Archegozetes longisetosus
By a narrow margin, a tiny oribatid mite (Archegozetes longisetosus) surpasses the dung beetle in relative pulling strength. At approximately 1 mm in length and a body weight of roughly 100 micrograms, it generates pull forces equivalent to about 1,150 times its own mass — five times higher than the force predicted by allometric scaling equations for an organism its size.
Oribatid mites are soil-dwelling decomposers, feeding on fungi, algae, and decaying plant matter. They have no obvious ecological need for extreme strength in the way the dung beetle does. The leading hypothesis is that the mite's claws are specialized for gripping plant surfaces and substrates, and the same adaptations that allow secure attachment in three-dimensional soil microhabitats produce extraordinary pull forces when measured in a straight-line strain gauge setup.
The study by Heethoff and Koerner (2007) measured force using a piezoelectric force transducer — a device that converts mechanical force into an electrical signal — attached to the mite via a fine wire. The mite was encouraged to walk away from a fixed point while restrained, generating the pull measurement. At 1,150× body weight, it surpasses the dung beetle record by about 1%.
The comparison illustrates why "strongest animal" requires a qualifier. By absolute force, the elephant wins by a large margin. By relative force, a 1-mm mite that most people will never see holds the record.
Source: Heethoff, M. and Koerner, L. (2007), "Small but powerful: the oribatid mite Archegozetes longisetosus Aoki (Acari, Oribatida) produces disproportionately high forces," Journal of Experimental Biology, Vol. 210 — force transducer measurements establishing the 1,150× body-weight record.
The Rhinoceros Beetle: Lifting the Heaviest Load
The rhinoceros beetle (Dynastes hercules and related species) is the strongest insect by the metric of weight carried on its back — the most intuitive version of "strength" for most people. Commonly cited figures put its load-bearing capacity at approximately 850 times its own body weight, meaning a 4-gram beetle can carry roughly 3.4 kg (7.5 lb) on its back without being impeded.
Like the dung beetle, rhinoceros beetle strength is a product of sexual selection. Males possess a large forked horn on their thorax, used to grip rival males and flip them from branches and logs during contests over mating sites. The mechanical demands of this wrestling behavior — lifting and leveraging another beetle's full body weight — require substantial thoracic and leg musculature.
Rhinoceros beetles were the most famous example of extreme relative strength before the dung beetle measurement surpassed them in 2010. The 850× figure is less precisely established than the dung beetle's 1,141× — it is based on load-carrying observations rather than controlled force measurements — but it has been widely replicated.
Elytra — the hardened front wings of beetles (Order Coleoptera), which protect the membranous flying wings underneath. In rhinoceros beetles, the elytra are robust enough to serve as a load-bearing surface during horn wrestling contests. Beetles fly by lifting the elytra and deploying the membranous hindwings beneath.
Leafcutter Ants: Strength in Context
Leafcutter ants (Atta and Acromyrmex species) of Central and South America routinely carry leaf fragments weighing 50 times their own body mass back to their underground nests. Workers cut pieces of leaves, flowers, and grasses and carry them in vertical columns over distances of hundreds of meters, maintaining this load through obstacles that would stop a proportionally loaded human.
The 50× figure for load carrying is the commonly cited field measurement. In lab conditions, workers can carry more — some studies report up to 8–10 times body mass as sustained carrying capacity, with structural failure of the neck joint requiring forces of 3,000–5,000 times body weight. The neck joint figure is a structural test — how much force does it take to pull the ant apart — rather than a behavioral measurement, but it illustrates that the limiting factor in leafcutter ant carrying is not the ant's muscle strength but the decision about what load is worth carrying: larger loads are less efficient per unit of energy, and ants optimize for colony-level foraging efficiency rather than individual maximum load.
Leafcutter ants are the dominant herbivores in many Neotropical ecosystems, harvesting an estimated 15–17% of all leaf production in some forests. Their underground fungus gardens, which decompose the leaf fragments and produce the food the colony actually eats, can extend 6 m (20 ft) below ground and contain hundreds of kilograms of fungal material. The relative strength of the workers is not incidental — it is central to the survival of one of the most ecologically significant animal societies on Earth.
Source: Burd, M. et al. (2010), "Head size, load-carrying performance and immunity in the leafcutter ant Atta colombica," Proceedings of the Royal Society B, Vol. 277 — field and laboratory measurement of load-carrying performance across worker size classes.
Bite Force: When Relative Strength Is About Jaws
Relative strength measured by bite force produces a different ranking, dominated by larger animals with mechanically advantaged jaw structures.
The highest bite force ever recorded is from the saltwater crocodile (Crocodylus porosus) at approximately 16,414 N (3,690 lbf) — measured directly with a force transducer by Gregory Erickson and colleagues at Florida State University. This is the highest absolute bite force of any living animal. Relative to body weight, however, large crocodiles weigh 500–1,000 kg (1,100–2,200 lb), so the ratio is lower than for smaller animals with comparably powerful jaws.
The Tasmanian devil (Sarcophilus harrisii) produces the highest bite force relative to body size of any mammal, approximately 418 N from an animal weighing about 8 kg (18 lb) — a ratio of roughly 52 N/kg, substantially higher than a lion or tiger at comparable body weight.
For insects, the leafcutter ant's mandible bite force — estimated at 800 mN, or about 2,600 times its body weight — is among the highest relative bite forces measured. This force is not incidental: cutting through leaf tissue of varying toughness requires the ant to apply controlled, precise force with a tool (the mandible) that must also grip the leaf fragment for carriage.
Source: Erickson, G.M. et al. (2012), "Insights into the Ecology and Evolutionary Success of Crocodilians Revealed through Bite-Force and Tooth-Pressure Experimentation," PLOS ONE, Vol. 7 — direct measurement of saltwater crocodile bite force at 16,414 N using a custom force transducer.
Source: Lailvaux, S.P. et al. (2012), "Performance capacity, fighting tactics, and the evolution of combat in Tasmanian devils," Journal of Experimental Biology — comparative bite force measurements in Tasmanian devils and their ecological context.
Why Small Animals Are Stronger: The Scaling Math in Detail
The square-cube law predicts not just that small animals are relatively stronger, but by how much. If body length scales by a factor n, and all other dimensions scale proportionally:
- Muscle cross-sectional area (determining force generation) scales as n²
- Body mass scales as n³
- Relative strength (force / body weight) scales as n² / n³ = 1/n
This means relative strength is inversely proportional to linear body size. Double an animal's body length while keeping proportions identical, and its relative strength halves. Scale it up by 10 times, and relative strength drops to one-tenth. This is not an approximation or a biological finding — it is a geometric inevitability.
Real animals deviate from this scaling prediction in both directions. The oribatid mite is five times stronger than the allometric prediction for its size, likely due to claw specialization. Large animals compensate partially through skeletal geometry — thicker bones relative to body length, more upright limb postures — which allows them to bear weight more efficiently, though never enough to overcome the scaling law entirely.
The practical limit on insect size is set partly by this scaling argument and partly by their respiratory system. Insects breathe through a network of tubes called tracheae that deliver oxygen directly to cells without blood transport. The tracheal system's efficiency decreases with size because the tubes must scale in diameter with oxygen demand, but oxygen diffusion rate does not scale equivalently. Above a certain body volume, passive diffusion through tracheae cannot supply enough oxygen to support the metabolic demands of the tissue, and the insect cannot function. The largest prehistoric insects — dragonflies of the Carboniferous with wingspans of 70 cm (28 in) — existed during a period when atmospheric oxygen concentrations were approximately 35% (compared to today's 21%), which extended the functional size limit of the tracheal system.
Source: Kaiser, A. et al. (2007), "Increase in tracheal investment with beetle size supports hypothesis of oxygen limitation on insect gigantism," Proceedings of the National Academy of Sciences, Vol. 104 — tracheal scaling analysis demonstrating oxygen limitation as a constraint on insect maximum size.
Frequently Asked Questions
Q: What is the strongest animal in the world by relative strength?
A: The strongest animal by relative pulling strength is the oribatid mite Archegozetes longisetosus, which generates pull forces approximately 1,150 times its own body weight — five times higher than allometric scaling equations predict for an organism its size. The horned dung beetle (Onthophagus taurus) holds the record among insects and comes a close second overall at 1,141 times its body weight, a figure measured in a controlled lab experiment at Queen Mary University of London in 2010.
Q: What animal exerts the greatest absolute force?
A: By absolute force, the saltwater crocodile (Crocodylus porosus) holds the bite force record at approximately 16,414 N (3,690 lbf), measured directly with a force transducer by researchers at Florida State University. For pulling and lifting force, large elephants and whales generate the greatest raw totals — an African elephant can carry loads exceeding 9,000 kg (20,000 lb) with its trunk and body combined — but their relative strength, as a fraction of their own body weight, is far lower than any of the invertebrate record holders.
Q: Which animal has the strongest bite force?
A: The saltwater crocodile holds the record for highest measured bite force of any living animal at 16,414 N, established by Erickson et al. (2012) using a custom force transducer. Among mammals, the Tasmanian devil produces the highest bite force relative to body size — approximately 418 N from an animal weighing around 8 kg, a ratio substantially higher than a lion or tiger at comparable body weight. Among insects, leafcutter ant mandibles generate an estimated 800 mN of force, roughly 2,600 times the ant's own body weight.
Q: Why are small animals so much stronger relative to their size than large ones?
A: This follows directly from the square-cube law, first described by Galileo in 1638. Muscle strength is proportional to muscle cross-sectional area, which scales as the square of body length. Body mass, however, scales as the cube of body length. As an animal gets larger, its mass grows much faster than its muscle cross-section, so the ratio of force to body weight — relative strength — falls in direct proportion to linear body size. Double an animal's length while keeping proportions identical and relative strength halves; scale it up tenfold and relative strength drops to one-tenth.
Q: What is the strongest insect?
A: The horned dung beetle (Onthophagus taurus) is the strongest insect by controlled, peer-reviewed relative pulling force measurement, at 1,141 times its own body weight. The rhinoceros beetle (Dynastes hercules) is often cited as able to carry approximately 850 times its body weight on its back, though that figure comes from load-carrying observations rather than precision force measurement. The dung beetle's record is specifically a product of sexual selection: males evolved extreme pulling strength to win tunnel-bracing contests against rivals competing for mating access.
Q: Are humans weak compared to other animals?
A: By relative strength, yes — humans are among the weaker animals. An elite powerlifter can lift roughly two to three times their own body weight, while a gorilla can exert six to ten times its body weight in climbing and lifting tasks. By the square-cube law this is expected: at human body size, the ratio of muscle cross-section to mass is inherently lower than for small animals. Humans partially compensate through skeletal geometry, upright posture, and tool use, but no amount of training can overcome the geometric constraint that makes a dung beetle 500 times stronger, pound for pound, than the world's strongest human.
The Takeaway
The strongest animals by relative strength are small, and this is not a coincidence. The square-cube law guarantees that as animal body size decreases, the ratio of muscle cross-section to body mass improves — producing higher relative forces even with identical muscle tissue quality. The dung beetle's 1,141× record and the oribatid mite's 1,150× record are expressions of basic geometry as much as evolutionary achievement. What evolution added is the specific behavioral context — tunnel fighting, substrate gripping — that selected for extracting maximum output from that geometric advantage. The physics constrains the range; selection determines where in the range a species lands.
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SciHub101 is an independent science and technology publication founded and edited by Buğra Sözeri, a software engineer and app developer based in Türkiye. AI tools assist with drafting and research. Source documentation in the existing archive is uneven, and articles are being reviewed and corrected. The Editorial Team byline identifies editorial responsibility; it does not certify specialist or independent human review. Where we compare products, anything built by our own team is labelled as such — see the editorial guidelines and About page for how corrections and disclosures work.
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