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Paleontologists identify a probable bite mark by documenting the trace’s shape, size, depth, edge texture and microscopic details, then testing that interpretation against the bone’s anatomy, healing response, fossil assemblage and plausible tooth makers. A trace can be confidently recognized as tooth damage even when the exact dinosaur that made it cannot be named.
What a bite trace looks like on fossil bone
Investigators begin with the physical mark, not a guess about the predator. They examine the surface under raking light, which casts shadows across shallow depressions, and at low magnification. A scale is recorded with photographs and measurements of length, width, orientation and, where possible, depth. A 10× hand lens can help an educator or collector see edges and striations, but it cannot establish a diagnosis or identify the animal responsible.
| Trace term | Diagnostic description | What it can suggest |
|---|---|---|
| Pit | A roughly rounded indentation that does not penetrate the cortical surface | A tooth pressed into bone without fully perforating it |
| Puncture | An indentation that penetrates the cortex | A tooth driven deeply enough to break through the outer bone |
| Score | An elongated mark that remains within the cortical surface | A tooth dragged across bone or moved obliquely |
| Furrow | An elongated groove that penetrates the cortex | A deeper drag or scrape by a tooth |
Some traces preserve a short drag at the end of a puncture or fine, parallel grooves. Those grooves may be impressions of tooth denticles—the small serrations along the cutting edges of many theropod teeth. Their spacing, orientation and shape are often more informative than the broad outline of a single hole.
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The diagnostic workflow, from surface to interpretation
- Map and photograph the feature. The specimen number, bone element, anatomical side and exact position are recorded. Oblique lighting and a scale bar reveal relief that can disappear in overhead light. Researchers document multiple views rather than selecting only the most dramatic angle.
- Measure the trace. Length, width, aspect ratio, depth and cross-sectional profile are compared with experimentally produced tooth marks and published fossil examples. Measurements are taken from the original surface where possible; casts and photographs can flatten or exaggerate relief.
- Describe edges and internal texture. Sharp or crushed rims, a smooth polished floor, microfractures, drag marks and parallel striations are noted. A single smooth margin is not proof of a bite, because nonfeeding processes can produce one.
- Classify the form. The mark is categorized as a pit, puncture, score or furrow, while recognizing that weathering can blur boundaries. Several marks on one bone are assessed together: repeated, similarly sized traces may represent a tooth row or a sequence of bites.
- Check the anatomy. A hole is compared with normal foramina, vascular canals, muscle attachments and other openings expected in that particular bone. Computed tomography can show whether a suspected perforation continues through internal bone in a pattern consistent with anatomy or trauma.
- Test competing explanations. Pathological lesions, fractures, abrasion during transport, surface erosion and bioerosion are considered explicitly. The 2026 Edmontosaurus study cautions that “The criteria for attributing a lesion to bite marks is precise but not exhaustive.”
- Assess the bone’s response. New bone growth, rounded healing margins or remodeling indicate that the injury was sustained while the animal was alive and survived long enough to react. An unhealed edge is compatible with damage near or after death, but it does not by itself distinguish a kill from scavenging.
- Compare possible tooth makers. Denticle spacing and mark geometry are compared with teeth known from the same fossil fauna. The conclusion is expressed at the strongest level the evidence supports—such as “theropod tooth trace” rather than a species name when several animals fit.
- Interpret the assemblage. The position of the mark, associated bones, articulation, sedimentary setting and preservation history are integrated before proposing feeding behavior.
Why tooth details can identify a maker—but often cannot
A serrated tooth can leave a fingerprint of parallel striations. Researchers measure the distance between ridges and compare their morphology with candidate teeth from the same formation. If the spacing and orientation match, attribution to a particular tooth type becomes stronger than an identification based only on a circular puncture.
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In a Lance Formation Edmontosaurus bonebed study, some well-preserved traces were attributed to Tyrannosaurus rex using trace shape together with denticle spacing. The authors also acknowledged that other marks were ambiguous and could have been made by crocodilians. This distinction is central: identifying a tooth trace is usually easier than proving which species made it.
Tooth wear, breakage and the angle of contact alter the mark. A damaged tooth may leave an incomplete striation pattern, while a perpendicular bite can make a serrated edge look like a simple pit. Consequently, a species-level assignment normally requires several matching features and a local fauna that actually contains the proposed maker.
Ruling out features that only resemble bites
Normal anatomy
Foramina and vascular channels can look like punctures when the surrounding surface is weathered. Their position, repeated occurrence in the same anatomical location and continuity through the bone favor an anatomical explanation. CT imaging is especially useful when a smooth-edged opening could be either a natural feature or a tooth hole.
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Pathology and healing lesions
Infection, tumors, stress injury and other diseases can remove bone or create raised margins. Reactive bone and organized remodeling indicate a living response, although they do not reveal the original cause without additional morphology. Suspicious lesions in the Edmontosaurus material were evaluated for bone reaction consistent with pathology rather than assumed to be feeding damage.
Fracture and postmortem breakage
Cracks radiating from an impact, crushed edges and matching fragments can point to breakage instead of a tooth. A fracture may intersect a genuine bite, so each feature is documented separately and its relative timing considered.
Weathering, transport and erosion
Sun exposure before burial, abrasion while a carcass was transported and chemical erosion can round edges, enlarge pits or remove fine striations. Compaction can deform a mark after burial. Cancellous (spongy) bone is particularly difficult because its open internal structure does not preserve a clean cortical trace.
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Bioerosion
Invertebrates, microbes and fungi can bore or etch bone. Clusters of small, irregular tunnels and branching galleries differ from a single mechanically formed tooth impression, but advanced weathering can erase those distinctions. The broader sediment and associated fossils help establish whether bioerosion was likely.
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Healed bite injuries are uncommon because most attacked dinosaurs did not survive long enough to deposit new bone. When remodeling is present, the bite occurred during life and the victim lived through at least part of the healing interval. A fresh-looking, unremodeled mark formed near death or after burial may represent an attack, scavenging, trampling or another impact; the absence of healing cannot select among those possibilities.
Location supplies behavioral context. Marks concentrated near muscle-rich ends, joints or areas where flesh was accessible may reflect feeding, while damage on exposed shafts can result from later access to a carcass. Researchers also ask whether the bone was still articulated. Associated or articulated skeletons preserve the original anatomical position and make it easier to distinguish a bite from damage acquired after disarticulation.
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Using the whole fossil assemblage
An isolated bone demands a cautious interpretation. Investigators combine the individual trace with the bone type, sediment, preservation, known predators and scavengers, and other damage at the site. A mark that is distinctive on a dense cortical shaft may be unreadable on thin or cancellous bone. Fragmentation, transport, compaction and surface weathering can hide traces or create look-alikes.
Assemblage context also determines whether a pattern is biologically meaningful. Repeated marks on many bones may indicate access to a carcass, but a concentration can also result from a site’s physical sorting or from bones rubbing together during transport. Mark orientation, spacing and position are therefore recorded rather than inferred from the number of damaged specimens alone.
Predation, scavenging and what marks can—and cannot—show
Bite marks occur on herbivore and theropod bones and can be produced during a kill or after death. A healed trace demonstrates an attack while the animal was alive; an unhealed trace demonstrates only that the bone had not remodeled. To argue for predation, paleontologists seek converging evidence such as injuries elsewhere on the skeleton, carcass articulation, tooth-mark distribution in flesh-bearing regions and signs that the animal was incapacitated. Scavenging becomes more plausible when damage is concentrated on a disarticulated carcass or exposed, nutrient-rich areas, but no single pattern is decisive.
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The safest conclusion may therefore be “tooth-marked bone” or “probable theropod feeding trace,” with predation versus scavenging left unresolved. That wording preserves what the specimen demonstrates without turning a plausible behavior into a certainty.
What published counts reveal—and why they are not universal rates
| Study or survey | Material and result | How to read the number |
|---|---|---|
| Mygatt-Moore Quarry study (2020) | 2,368 vertebrate fossils surveyed; 684 (28.885%) had at least one theropod bite mark | A site-specific sample, not the proportion of dinosaur fossils generally |
| Edmontosaurus bonebed study (2026) | Approximately 0.4% of examined South and North quarry material excavated and prepared through 2017 had unambiguous tooth traces | A different assemblage and a stricter “unambiguous” threshold; it should not be directly compared with the Mygatt-Moore percentage |
| Morrison Formation sauropod survey (2023) | 68 sauropod bones with theropod-attributed bite traces were catalogued from literature and collections | A catalogue count, not a prevalence estimate for all sauropod bones |
Differences in quarry environment, collecting methods, preparation, bone types, preservation and classification thresholds can change the apparent frequency dramatically. A low count may mean bites were rare, poorly preserved or difficult to recognize; a high count may reflect exceptional exposure or a concentration of carcasses.
How conclusions are reported
Papers normally separate three claims: what the mark is, what made it and what happened behaviorally. The first may be “puncture with denticle striations.” The second may be “consistent with a tyrannosaurid tooth” or, when evidence is weaker, “theropod.” The third may remain “feeding damage of uncertain timing.” Keeping those levels distinct prevents a recognizable trace from being presented as a complete story.
Researchers also state uncertainty explicitly when criteria do not cover every lesion. A well-preserved combination of morphology, denticle spacing, anatomy and assemblage context supports a stronger attribution than any one measurement. Conversely, a smooth hole, an isolated weathered bone or a mark lacking diagnostic striations should remain provisional.
Quick Recap
Key takeaways for examining a specimen
- Start with lighting, scale and measurements; do not identify a predator from appearance alone.
- Use the pit, puncture, score and furrow categories, then record depth, edge texture and any drag or denticle striations.
- Check normal anatomy, pathology, fracture, erosion and bioerosion before calling a feature a bite.
- Use remodeling to establish survival after injury, not to decide predation versus scavenging by itself.
- Compare trace details with teeth present in the same fauna and state the identification at the narrowest defensible level.
- Treat prevalence figures as properties of their particular assemblages and methods, never as a universal dinosaur-bite rate.
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