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A fossil bite mark does not identify its maker by itself. Scientists must first show that the feature is a tooth trace rather than an anatomical opening, disease lesion, break, or other surface alteration. They then measure the mark, compare its geometry and microscopic details with plausible teeth, test whether the candidate animal lived in the same place and time, and state the conclusion at the narrowest level the evidence supports. The result may be a broad group such as theropods, a ranked list of candidates, or an unresolved attribution—not necessarily a dinosaur species.
The biter may not even have been a dinosaur. Marks on dinosaur bones can fit mammals or other animals, so the question must be treated as an evidence problem rather than an assumption that a dinosaur bone was bitten by a dinosaur.
What must be established before naming a biter?
Identification has three separate stages that should not be collapsed into one claim:
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- Trace-maker group: What kind of tooth or animal could have produced its shape, spacing and surface details?
- Taxonomic precision: Does the evidence justify a particular dinosaur family, genus or species?
A study can support the first stage while leaving the second uncertain, or support a theropod attribution without distinguishing among several theropod taxa. A defensible report says which stage has been reached and which remains unresolved.
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1. Verify that the feature is a tooth trace
Begin with the complete bone and its find context, not an isolated photograph of a depression. The 2026 PLOS ONE study of a Maastrichtian Edmontosaurus annectens bonebed in Wyoming’s Lance Formation emphasizes that interpretation becomes ambiguous when context is ignored. Neurovascular foramina—normal openings for nerves and blood vessels—and lesions caused by pathology have both been mistaken for tooth traces.
Record the trace’s physical description
For every suspected mark, document:
- outline and margins, including whether the edge is sharp, crushed, rounded or irregular;
- cross-section, length, width and maximum depth;
- orientation relative to the bone’s long axis and anatomical surfaces;
- whether it is a pit, puncture, gouge, score, groove or a combination;
- whether marks occur singly, in parallel rows, in pairs or in another repeated arrangement;
- fine striations or scratches within the larger feature;
- the bone region and surface on which it occurs; and
- evidence of cracking, abrasion, weathering or sediment infill that could have modified the original mark.
No generic shape is universally diagnostic. A round hole, for example, can be a bite puncture, a natural opening or a pathological cavity. Interpretation depends on the combination of geometry, surface relief, placement and specimen context.
Exclude non-biting processes
Examine alternatives before comparing dinosaurs. Anatomical openings generally follow the bone’s normal vascular or structural pattern. Pathological lesions may have remodeled rims, irregular internal surfaces or other signs of disease. Breakage, trampling, sediment abrasion and preparation damage can create grooves or pits that resemble feeding traces. If these possibilities are not addressed, a later comparison with dinosaur teeth only gives a false impression of certainty.
2. Compare geometry with plausible teeth
Once a tooth origin is supported, compare the mark with the teeth that could have made it. Useful observations include the dimensions of individual traces, spacing between repeated marks, the angle at which a tooth contacted the bone, and whether a set of marks records a tooth row or a single tooth moving across the surface.
Use striations and denticles as additional clues
Serrated teeth can leave minute, parallel striations produced by their denticles. The pattern and spacing of those striations can help identify a tooth type and provide a minimum estimate of the tooth or biter’s size. Such microscopic evidence is most informative when researchers have comparative teeth from animals that actually occupied the relevant ecosystem.
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A broad groove may be compatible with several carnivores, whereas a distinctive combination of groove width, denticle striation and repeated spacing can narrow the list. The comparison should use measured specimens or documented reference material, not a visual resemblance to a popular dinosaur illustration.
3. Build the candidate list from time, place and anatomy
Identify the host bone and host animal as far as preservation allows. Record the geological formation, age, geographic locality, depositional setting and associated fossil fauna. Then ask which animals were present and whether their teeth, body size and feeding behavior could produce the observed trace.
Context narrows the possibilities
Geological context is a filter, not proof. A tooth type must be available in the same ecosystem and time interval, but presence alone does not show that the animal made the mark. Anatomical context matters too: a mark on a thin rib, a vertebral process or a robust limb shaft presents different contact opportunities and mechanical constraints.
The 2023 PeerJ study Bite and tooth marks on sauropod dinosaurs from the Morrison Formation surveyed 68 sauropod bones with traces attributed to theropods. That count describes the study sample, not the prevalence of bite marks in sauropod fossils or a general identification success rate. The authors also note that individual traces can be difficult to assign when multiple credible candidates remain.
Test the assumption that the maker was a dinosaur
In a 2010 Palaeontology paper, researchers described paired grooves on Late Cretaceous dinosaur bones from Alberta and argued that mammals—most likely multituberculates—were the best candidates. Their interpretation contrasted the traces with insect damage and other possible makers. This case demonstrates why the host animal does not determine the trace-maker: a dinosaur carcass could be gnawed by a mammal, an insect or another non-dinosaur animal.
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4. Compare candidates systematically
When more than one biter remains possible, evaluate each candidate against the same evidence axes. These comparisons organize uncertainty; they are not a validated numerical scoring system.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minute| Evidence axis | Question to ask | What strengthens a candidate | What weakens it |
|---|---|---|---|
| Tooth geometry | Can the known tooth shape make the trace’s outline, cross-section and dimensions? | Measured tooth-to-trace correspondence, including matching serrations | Required tooth features or dimensions are absent |
| Spacing and arrangement | Do repeated marks fit the candidate’s tooth row or a plausible movement of one tooth? | Spacing and orientation match documented dentition | Pattern would require an implausible jaw position or tooth spacing |
| Time and place | Did the animal occur in the formation and interval where the bone was found? | Reliable fossils from the same ecosystem | No record from the relevant region or age |
| Size and mechanics | Could the animal’s tooth and jaw dimensions generate the mark without unrealistic force? | Trace scale fits known tooth size and likely contact | Mark is too large, small or mechanically incompatible |
| Placement and behavior | Does the location fit feeding, scavenging, combat or another contact? | Orientation and bone position suit a plausible interaction | Contact would require an unlikely posture or behavior |
| Alternative explanations | Have pathology, foramina, insects and physical abrasion been excluded? | Independent observations rule out competing processes | A non-biting explanation remains equally plausible |
5. Use imaging to answer specific questions
External inspection remains essential, but imaging can reveal evidence hidden below the surface. Computed tomography (CT) may show internal morphology around a trace, including cracks, displaced bone or a response to injury. A 2015 study in Annales Societatis Geologorum Poloniae used CT visualization of bite-trace ichnotaxa on a dinosaur bone to help distinguish healed from non-healed wounds.
What CT can and cannot establish
- It can help with: internal shape, damage extent, displacement and signs that bone remodeled after an injury.
- It cannot by itself do: uniquely identify the dinosaur or other animal that made the mark.
Three-dimensional surface scanning can document relief and allow repeatable measurements of grooves, pits and striations. However, the available evidence does not establish one universal consumer device or a single standardized identification workflow. Imaging should be selected because it answers a defined question, not because a scan automatically produces a species name.
6. Interpret the mark’s biological story carefully
Tooth marks can reflect active predation, scavenging, carcass processing, opportunistic feeding, competition over a carcass or non-feeding contact. The mark alone rarely distinguishes all of these behaviors. Bone location, orientation, clustering and associated damage can support one interpretation, but behavioral conclusions should remain separate from taxonomic identification.
The abstract of the 2023 Morrison Formation study states that “Tooth-marked bones provide important evidence for feeding choices made by extinct carnivorous animals.” That observation explains why traces matter, while still leaving the identity of an individual biter to be tested by morphology and context.
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7. Report the narrowest defensible conclusion
Use calibrated language that matches the strength of the comparison:
- “Consistent with a tooth trace” when the feature has tooth-like characteristics but alternatives have not been fully excluded.
- “Supports a theropod trace-maker” when geometry, striations and context favor theropods over other groups.
- “Most likely made by [a specified group]” when one candidate fits substantially better but distinctive evidence is still lacking.
- “Attributed to [a genus or species]” only when the trace contains features that distinguish that taxon from credible alternatives and the comparative sample is adequate.
- “Indeterminate” when preservation, missing comparative teeth or competing explanations prevent a reliable assignment.
Separate the statements “this is a tooth trace,” “this kind of animal probably made it” and “this exact dinosaur taxon made it.” A report can reach the first two while leaving the third open.
A practical identification workflow
- Map the specimen. Photograph and record the entire bone, anatomical orientation, locality, formation, age and associated fossils.
- Describe every feature. Measure length, width and depth; document cross-section, margins, orientation, repetition and fine striations.
- Check anatomy and pathology. Compare the feature with normal foramina and known lesions in the host bone and taxon.
- Assess surface modification. Rule out weathering, trampling, abrasion, preparation damage and insect activity.
- Confirm tooth-trace morphology. Use the combined pattern of pits, scores, grooves, punctures and striations rather than one shape.
- Assemble contemporaneous candidates. List dinosaurs, mammals and other animals known from the same formation and interval.
- Compare dentitions. Test tooth dimensions, serration or denticle patterns, spacing and jaw mechanics against the traces.
- Use targeted imaging. Apply CT or three-dimensional scanning when internal damage, healing or surface relief could change the interpretation.
- Rank and document alternatives. Explain why each candidate fits or fails and which non-biting explanations remain.
- State the conclusion at the supported level. Give a group-level or ranked attribution when species-level evidence is not distinctive.
Why exact species identification often remains uncertain
Several factors limit precision. Different animals can have overlapping tooth shapes; one animal can produce different traces depending on bite angle and whether a tooth was dragged; and the original surface may be worn, crushed or incomplete. Fossil collections also contain uneven samples of teeth and bones, making some comparisons far better documented than others.
Multiple candidate biters may have shared an ecosystem. Even a convincing theropod trace may not distinguish among genera if their teeth overlap in size and serration pattern. Conversely, an unusual arrangement of marks can be informative without proving a species if the relevant dentition is poorly known.
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What the evidence cannot currently promise
There is no general success rate for identifying fossil bite-mark makers, no universal threshold that guarantees species-level attribution, and no validated consumer test that returns an exact dinosaur identity from a photograph or scan. Claims should therefore identify the observations, comparisons and exclusions that support them instead of presenting a confidence percentage that has not been established.
The strongest conclusion is often deliberately limited: a feature is a tooth trace, it is most compatible with a particular broad group, and other candidates are less well supported. That level of caution preserves what the fossil can actually show.
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