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EXHIBIT 02

Triceratops

Triceratops horridus

Three horns, a broad frill, and a plant-eater beneath the formidable silhouette.

Evidence profile

TWO WAYS TO PICTURE THE PAST

Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.

01 / SCIENTIFIC RECONSTRUCTION

An animal, reconstructed

Triceratops in side view on four legs, with two long brow horns, a nose horn and a broad red-gray frill.

The artist based this reconstruction on Horridus, specimen P 256878. Its skull constrains the beak, frill and three horns. Separately, skin impressions attributed to T. horridus inform the scaly surface. Colors, horn coverings and the exact soft-tissue outline are interpretations; one individual’s horn shape does not define the whole species. [6] [5] [3]

Triceratops horridus — Connor Ashbridge. CC BY-SA 4.0. Resized and converted to WebP; complete composition retained.

02 / MOVIE-STYLE INTERPRETATION

A cinematic imagination

Three-horned Triceratops on four legs in a forest, with a large textured frill and rugged skin.

A cinematic three-horned giant with rough armor-like skin and dramatic horn silhouettes. The basic body plan is recognizable, but extra texture, horn proportions, coloring and the forest scene are artistic choices rather than a reconstruction of Horridus. [5] [3]

Original artwork · artistic interpretation.

Scientific view: credited paleoart interpreting fossil evidence. Movie-style view: Original artwork. Colors and many soft tissues are uncertain.

PERIODLate Cretaceous[2]
DIETHerbivoreInferred from related anatomy [1]
TOTAL LENGTH9 mApproximate adult reference estimate [7]
FOSSILS FOUNDNorth America, USA[1]
CompareRead the dossierView the sources

MEET THE ANIMAL

Meet Triceratops

Triceratops horridus was a plant-eating dinosaur from Late Cretaceous North America. Three horns and a broad frill behind its head make its skull easy to recognize. Beneath those dramatic features, a sharp beak cropped vegetation and rows of teeth processed it. Its sturdy limbs carried it on four legs, so the body tells a useful story beyond the famous head. [S1]

The specimen nicknamed Horridus came from Montana and provides one individual example of this species. Its reconstruction is not an average of every Triceratops. A individual can show which bones and body features are preserved, while missing parts still require restoration. Knowing which animal a description concerns keeps a comparison from becoming a claim about an entire species. [D2]

The broader genus also provides a growth series. Researchers compared baby, juvenile, subadult and adult skulls and documented changing horns and frill edges. They proposed that these changes could help animals recognize age and maturity. This is an explanation of a visible pattern, not a recorded mating ceremony. A young skull should therefore not be interpreted as a miniature adult head with every feature already fully developed. [S2]

Overview sources
  1. TriceratopsNatural History Museum, London · Accessed 2026-10-04Inspected: page
  2. Major cranial changes during Triceratops ontogenyHorner & Goodwin - Proceedings of the Royal Society B · Accessed 2026-10-04Inspected: page

PREHISTORIC ANIMAL DOSSIER

A life in profile.

The animal, the evidence, and the questions still open.

Triceratops horridus combined a large horned skull with a plant-processing beak and jaws. Its fossil anatomy is much better constrained than mating rituals or the size of social groups.

Profile scope: Species — Triceratops horridus

Time
Late Cretaceous
Fossil locations in this exhibit
North America, USA
How to read the evidence

Source supported identifies a description documented by the cited source. Inferred marks a reconstruction or functional estimate. Debated marks competing interpretations. Not established means the sources reviewed for this dossier do not support a firm conclusion; it does not mean a behavior never occurred.

A size reference is an estimate, not a population range. Nesting evidence does not by itself establish courtship, mate choice, or lifelong pairing.

Body length

Inferred

About 9 m (adult museum reference)

Redpath gives 9 m as an adult reference for T. horridus. It is an approximate reconstruction, not an observed population average. [D1]

Body mass

Inferred

About 6–12 tonnes (museum reference)

Redpath provides this broad adult reference interval. It is not an observed distribution of living mass. [D1]

Diet and feeding

Source supported

Plant eater

The beak cropped vegetation and powerful jaws processed it. Specific plant choices such as small trees remain interpretations. [D1]

Habitat and setting

Source supported

Western North American fossil localities

Fossils occur in western North America; the Horridus specimen came from Montana. Locality and burial setting do not establish a single preferred habitat. [D1] [D2]

Movement

Source supported

Walked on four legs

Its limbs supported quadrupedal movement. This describes posture rather than a verified maximum speed. [D1]

Distinctive anatomy

Source supported

Three horns, frill, beak and jaws

Horns and the frill changed during growth. Their presence is observed; assigning a single function is harder. [D1]

Reproduction & life together

Reproduction and nesting

Not established

Not established here

Reviewed sources do not establish a T. horridus clutch size, nest arrangement or parental-care pattern.

Mating and courtship

Inferred

Horn and frill display proposed

The museum suggests the changing horns and frill could attract mates. That proposal does not establish sex differences or a courtship ritual. [D1]

Social behaviour

Not established

Not established here

A species-specific social-group size has not been verified in this review; the museum's large-pack claim is not adopted without supporting research.

Dossier research & sources

Sources and inspection notes for the claims in this profile.

  1. TriceratopsRedpath Museum, McGill University · Accessed 2026-10-02T. horridus size, diet and quadrupedal anatomy; display suggestions · Inspected: page
  2. All about HorridusMuseums Victoria · Accessed 2026-10-02T. horridus specimen Horridus; fossil setting and completeness · Inspected: page

THE STORY IN THE FOSSILS

Meet Triceratops.

The Montana specimen nicknamed Horridus belongs to Triceratops horridus. Museums Victoria describes this individual as about 67 million years old and seven metres long, and identifies it as a plant-eater. As genus context, Triceratops had a beak and cutting teeth beneath its horns and frill. [1] [2]

Museums Victoria reports skin impressions attributed to T. horridus, including hexagonal scales and larger scales with raised centres. These impressions constrain surface texture. They do not establish the animal’s colour pattern; colours in a reconstruction remain a palaeoartist’s interpretation. [3]

A 2014 study examined more than 50 Triceratops skulls from Montana’s Hell Creek Formation. It found T. horridus lower in the formation and T. prorsus in the upper third, with intermediate forms between them. The authors considered this sequence consistent with a lineage changing over time. [4]

A note on scale and time

Redpath Museum gives 9 m as an adult reference for Triceratops horridus. This approximate museum estimate is not a measured population average or complete biological size range. A numerical age interval has not been reviewed here. Unknown does not mean zero.

Redpath Museum’s adult reference estimates for Triceratops horridus. This broad museum interval is not an observed species mass distribution. [7]

Sources & editorial notes

Sources and evidence notes for this exhibit.

  1. Triceratops Toolkit: Kindergarten & Early YearsMuseums Victoria · Accessed 2026-10-02PDF p. 4, Meet Horridus: explicitly identified T. horridus individual, approximate age, specimen length, plant diet and Montana locality. PDF p. 5, Triceratops Features: genus context for beak, teeth, horns and frill; not a species measurement range.
  2. All about HorridusMuseums Victoria / Melbourne Museum · Accessed 2026-10-02Meet the Melbourne Museum Triceratops; Horridus was alive during the Late Cretaceous; Montana locality. Explicitly names the specimen's species. The page's up-to-8-metre size and 6–12-tonne statements are genus-level and are not used as species ranges.
  3. Horridus revealedMuseums Victoria / Melbourne Museum · Accessed 2026-10-02How do we know what Horridus might have looked like? Species-specific skin-impression statement; But what about the colour? Reconstruction and palaeoart context.
  4. Evolutionary trends in Triceratops from the Hell Creek Formation, MontanaProceedings of the National Academy of Sciences; abstract and figure captions hosted by PubMed / National Library of Medicine · Accessed 2026-10-02Abstract and Fig. 4 caption; Scannella, Fowler, Goodwin & Horner (2014), DOI 10.1073/pnas.1313334111. Species-specific skull succession in the Montana Hell Creek Formation. Original-paper abstract inspected; publisher full text returned a cookie wall and PMC a captcha.
  5. Specimen P 256878: Horridus the TriceratopsMuseums Victoria Collections · Accessed 2026-10-02Summary; Taxon Name; Species Name
  6. File:Triceratops horridus.pngConnor Ashbridge / Wikimedia Commons · Accessed 2026-10-02Creator-supplied Summary and caption explicitly identify a life reconstruction based on P 256878. Art provenance only.
  7. TriceratopsRedpath Museum, McGill University · Accessed 2026-10-02Vital statistics: Species Triceratops horridus; adult length 9 metres; adult weight 6–12 tonnes. Separate Sara quick facts describe an individual. Use only adult measurements; do not import outdated age or unsupported pack-behaviour statements.

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