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The strongest interpretation is therefore cumulative rather than based on one dramatic puncture. A trace can be confidently identified as tooth damage without proving whether a tyrannosaur, crocodilian, another theropod, or an unknown scavenger made it—or whether the bite happened during an attack or after death.
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What counts as a bite trace?
Researchers begin with a descriptive vocabulary. The terms describe geometry, not automatically the identity of the animal that made the mark.
| Trace type | What it looks like | What it indicates |
|---|---|---|
| Pit | A roughly rounded indentation that does not pass through the cortical surface | A tooth pressed into the bone without fully perforating it |
| Puncture | An indentation that penetrates the cortical surface | A deeper tooth impact that breaks through the outer bone |
| Score | An elongate groove that remains within the surface | A tooth dragged across the bone |
| Furrow | An elongate groove that cuts into or through the surface | A stronger dragging or slicing action |
Traces may also include short drag marks and fine, parallel striations. A single tooth can leave several features at once: a pit where its tip contacted the bone and scratches where it moved. Investigators photograph and map each feature rather than treating an entire damaged area as one mark.
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How the examination is done
1. Inspect the surface and make a record
Work starts with the cleanest view possible. Paleontologists examine the fossil under raking light, which casts shadows across shallow relief, and at low magnification. They record the mark’s position, orientation, length, width, depth, and relationship to cracks, joints, muscle attachments, and other lesions. Scales in photographs and repeatable measurements allow another researcher to check the description.
A 10× hand lens can help students or field workers see edges and striations, but it is only an observation aid. It cannot establish that a feature is a bite or identify the trace maker.
2. Measure geometry, depth, and edges
Shape and dimensions narrow the possibilities. A rounded, steep-sided puncture differs from a long, shallow score. Investigators note whether margins are sharp, crushed, beveled, polished, or irregular; whether the floor is smooth or ridged; and whether the mark tapers in a direction that suggests tooth movement. Depth profiles can be obtained with microscopy or three-dimensional surface scans when a specimen is important enough to justify them.
Measurements are compared with the size and spacing of candidate teeth, but a simple size match is not proof. Bone flexes, teeth may enter at an angle, and weathering can widen a groove after it formed.
3. Look for denticle striations
Serrated theropod teeth can leave parallel, closely spaced scratches from their denticles. Researchers measure the spacing, orientation, and morphology of those striations and compare them with teeth recovered from the same fauna. This is more informative than a generic groove because denticle spacing can be characteristic of a tooth type.
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Even so, striations are rarely a fingerprint. A damaged or incomplete trace may preserve only part of the pattern, and different predators can have overlapping tooth dimensions. In the Lance Formation Edmontosaurus study, some well-preserved traces were attributed to Tyrannosaurus rex using trace form and denticle spacing, while other marks remained compatible with a crocodilian or another biter.
4. Check anatomy and bone response
Location matters. A mark on a thin process, joint surface, or muscle attachment has a different anatomical context from one on a broad shaft. Associated or articulated bones show how the feature relates to the skeleton; an isolated bone requires more caution because orientation and identity may be uncertain.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsResearchers also inspect the surrounding tissue for remodeling or new bone growth. A raised, irregular rim or infilling can indicate that the animal survived long enough to heal after an injury. The absence of remodeling is consistent with damage inflicted near or after death, but it does not distinguish a kill from later scavenging.
5. Compare the local tooth-bearing fauna
Only animals that lived in the relevant ecosystem are realistic candidates. Investigators compare the trace with teeth from the same formation or assemblage, considering crown shape, serration size, curvature, and tooth spacing. A candidate absent from the deposit should not be used merely because its bite would look impressive.
Attribution is usually expressed in levels of confidence: “tooth trace,” “theropod bite,” or a particular genus when morphology and context justify that precision. Identifying the mark is often easier than identifying the maker.
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6. Test alternative explanations
Before accepting a bite interpretation, paleontologists ask whether a non-biting process fits the evidence better. The 2026 PLOS ONE authors state: “The criteria for attributing a lesion to bite marks is precise but not exhaustive.” Their warning is important because several natural features can imitate punctures or pits.
Features that can mimic a bite
Normal anatomy
Foramina, vascular openings, muscle attachments, and other anatomical structures can appear as clean holes. Smooth margins alone are not decisive. Researchers use the bone’s position in the skeleton, the expected orientation of an opening, and three-dimensional imaging such as CT to determine whether a suspected perforation follows normal anatomy.
Pathology
Infection, tumors, cysts, and other diseases can create irregular cavities or cause reactive bone. A lesion surrounded by abnormal new bone, or one repeated in a pattern associated with disease, may be pathological rather than traumatic. In the Edmontosaurus work, some suspicious openings showed bone reaction consistent with pathology.
Fracture and mechanical damage
Broken edges, crushing, and pressure cracks can produce angular depressions or elongated grooves. Investigators examine whether a mark continues into a fracture, whether the edges show brittle failure, and whether several fragments fit together. Transport and compaction can enlarge an original break or make separate damage events look connected.
Weathering, erosion, and bioerosion
Exposure before burial rounds edges and opens cracks. Water and sediment can scour a surface, while invertebrates, fungi, or microorganisms may etch tunnels and pits. These processes often have irregular distributions or branching patterns unlike a tooth impression, but poor preservation can erase the distinction. Cancellous bone is especially difficult because its porous interior naturally creates complex cavities.
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How researchers infer the biter
Trace-maker identification combines five evidence axes rather than relying on a single resemblance:
- Morphology and dimensions: the pit, puncture, score, or furrow’s outline, size, and orientation.
- Depth and edge texture: crushing, beveling, polish, and preserved denticle striations.
- Anatomical setting and bone response: where the mark lies and whether the bone remodeled.
- Candidate fauna and tooth morphology: which predators or scavengers were present and whether their teeth fit.
- Assemblage and preservation: whether the bone is associated with others and how transport, weathering, or erosion may have altered it.
A set of parallel grooves with spacing that matches a serrated tyrannosaur tooth can support a tyrannosaur attribution. If the same mark also fits crocodilian teeth present in the deposit, the responsible description may remain “large predatory tooth trace.” Scientific caution is not a failure; it reflects the limits of the preserved evidence.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can a bite mark show that a dinosaur was attacked?
Sometimes, but not by itself. A healed bite on a living animal requires time for bone remodeling, so new growth around a lesion is evidence that the injury was sustained before death. Such cases are uncommon; museum summaries note that only rare attacked dinosaurs survived long enough to form new bone.
An unhealed mark could have been inflicted immediately before death, during feeding on a carcass, or after the animal died. Lack of healing therefore indicates timing relative to survival, not the motive of the biter. To distinguish predation from scavenging, researchers examine the number and distribution of marks, which bones were targeted, whether the skeleton was articulated, and what other damage and sedimentary evidence occur at the site.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallMarks on both herbivore and theropod bones are known. A concentration around meat-rich regions may be consistent with feeding, but transport, burial conditions, and the availability of exposed carcasses can produce similar patterns. The event must be reconstructed from the whole assemblage.
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Why the fossil assemblage changes the answer
Context can strengthen or weaken an interpretation. Articulated or associated bones preserve anatomical relationships and can reveal whether damage occurred before dismemberment. Isolated elements provide fewer controls, so the individual mark, bone type, local fauna, and preservation history carry more weight.
- Fragmentation: breaks can remove the original edge of a trace or create false grooves.
- Transport: rolling in a channel can abrade exposed surfaces and move bones away from the place of death.
- Compaction: pressure can deform pits and close or widen cracks.
- Weathering: surface cracking and flaking can obscure fine striations.
- Erosion: exposed bone may lose the margins needed for measurement.
- Bone type: porous cancellous regions are harder to distinguish from bioerosion than dense cortical bone.
These factors explain why two studies can report very different frequencies without either being wrong.
What published counts actually mean
| Study and sample | Reported finding | How to interpret it |
|---|---|---|
| Mygatt-Moore Quarry study (2020) | 2,368 vertebrate fossils surveyed; 684 (28.885%) had at least one theropod bite mark | A site-specific proportion from that quarry and its methods, not a general rate for dinosaur fossils |
| 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 compared directly 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 |
Sampling, preparation, preservation, and classification thresholds control these numbers. A quarry with abundant exposed carcasses may preserve more feeding traces than a deposit where bones were rapidly buried, while a study that counts only unmistakable traces will report fewer marks than one that includes probable examples.
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- Photograph the feature with a scale under normal and raking light.
- Record its position on the bone and identify the bone, side, and anatomical region if possible.
- Classify the form as pit, puncture, score, furrow, or a combination.
- Measure length, width, depth, orientation, and spacing when multiple marks occur.
- Inspect margins and floors at low magnification for crushing, polish, drag marks, or parallel striations.
- Check CT or other three-dimensional data when a hole might be anatomical or internal damage is suspected.
- Look for remodeling, reactive bone, or other signs of pathology.
- List predators, scavengers, and non-biological processes present in the local geological context.
- Compare tooth shape and denticle spacing only with plausible animals from that fauna.
- State the conclusion at the narrowest level supported: tooth trace, predator group, or named taxon.
This workflow prevents a visually striking hole from carrying more certainty than the fossil can support. It also leaves a record that future researchers can reassess if better comparative material or imaging becomes available.
The limits of bite-mark identification
Fossil damage is a filtered signal: the original contact may be altered by decay, burial, movement, mineral replacement, and preparation. A missing margin can erase the feature that would have distinguished a tooth from a fracture. Conversely, a smooth, isolated depression can look convincing while actually being anatomy or disease.
For that reason, paleontologists separate three questions: Was the feature made by a tooth? What kind of animal could have made it? What was happening when the contact occurred? The first question may have a strong answer while the second is tentative and the third remains unresolved. Reporting those levels separately is what makes the interpretation scientifically useful.
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