Body length
InferredMuseum reference estimate:7 m.
Reference reconstruction rather than an adult population range. [D3]
EXHIBIT 276
Brachylophosaurus
Brachylophosaurus canadensis
Dinosaur
A plant-eating hadrosaur with a low, backward-projecting paddle crest; the famous Leonardo specimen preserves remarkable skin impressions. [2]
TWO WAYS TO PICTURE THE PAST
Science & the silver screen
Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.
01 / SOURCE-INFORMED RECONSTRUCTION
A life reconstruction from the evidence
Image unavailableIllustrative life reconstruction of Brachylophosaurus in a period-appropriate environment; coloration and missing anatomy are interpretations.The exhibit and its credited image source remain available.
An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. [2]
Source-informed reconstruction. Appearance evidence [2]. Original illustration; missing anatomy, coloration and scenery include interpretation.
Fossils constrain this life reconstruction. Missing anatomy, coloration and the environmental scene include interpretation; the dossier explains the evidence limits.
02 / MOVIE-STYLE INTERPRETATION
A cinematic imagination
Image unavailableIllustrative reconstruction of Brachylophosaurus canadensis; missing anatomy, pose, skin and colors are hypotheses.The exhibit and its credited image source remain available.
An illustrative reconstruction. Compare its anatomy with the evidence and limitations in the dossier. Lighting, coloration and scenery are artistic choices. This image does not document a fossil locality or behavior.
Original artwork · artistic interpretation.
Scientific view: source-informed reconstruction, credited paleoart or specimen-based imagery. Movie-style view: Original artistic interpretation. Reconstructions involve uncertainty.
PERIODLate Cretaceous[1]
DIETHerbivoreEvidence and uncertainty in the dossier
TOTAL LENGTH7–7 mEstimate scope matters
FOSSILS FOUNDCanada, United States[1]
MEET THE ANIMAL
Meet Brachylophosaurus
Brachylophosaurus was a plant-eating duck-billed dinosaur. A broad beak and a low paddle-shaped crest make its head recognizable. Unlike a tall hollow crest, this ornament extended backward over the skull roof. Researchers studying related hadrosaurs compared both bone shapes and maturity, showing why young animals should not automatically receive different names from adults. [D1]
One especially famous specimen is nicknamed Leonardo. Fossilized impressions preserve much of its skin, including small polygonal scales. The museum account also describes a fuller, muscular neck and fingers wrapped together in a mitten-like covering. These details help artists move beyond bare bones. Even so, preserved skin outlines do not reveal a reliable living color pattern. [D2]
Growth studies provide another kind of information. Researchers compared developing skeletons from Brachylophosaurus and other plant-eating dinosaurs. The Brachylophosaurus specimens in that study came from bonebeds, while some other animals were represented in nesting horizons. That difference matters: young bones collected together are useful evidence about growth, but they do not automatically prove an assigned nest, parental care or a particular family structure. [D4]
PREHISTORIC ANIMAL DOSSIER
A life in profile.
The animal, the evidence, and the questions still open.
The Leonardo specimen provides unusually informative skin and soft-tissue outlines alongside skeletal anatomy. [D2]
Profile scope: This exhibit centers on Brachylophosaurus canadensis; uncertain B.goodwini material is excluded. [D1]
- Time
- Late Cretaceous
- Fossil locations in this exhibit
- Canada, United States
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 mass
Not establishedNot established here
The inspected sources do not establish an adopted quantitative mass model. [D4]
Diet and feeding
InferredPlant-eating hadrosaur.
Herbivory does not establish one universal menu for every individual. [D3]
Habitat and setting
InferredCampanian terrestrial deposits in Montana and Alberta.
Judith River and Oldman occurrences represent fossil settings, not exclusive habitat preference. [D1]
Movement
InferredTerrestrial movement on robust limbs.
Postcranial development is documented; gait and speed are inferred rather than filmed. [D4]
Recognizable anatomy
InferredBroad beak, flat paddle crest and scaly skin.
Leonardo preserves mitten-like forehands and a fuller fleshy neck outline. [D2]
Reproduction & life together
Reproduction and nesting
Not establishedNot established here
Reviewed Brachylophosaurus growth specimens came from bonebeds, not assigned nesting horizons. [D4]
Mating and courtship
Not establishedNot established here
Crest growth does not establish sex-specific ornaments or a courtship sequence. [D1]
Social behavior
Not establishedNot established here
Bonebed association alone does not establish daily herd size or family organization. [D4]
Dossier research & sources
Sources and inspection notes for the claims in this profile.
- Freedman Fowler and Horner (2015), A New Brachylophosaurin Hadrosaur with an Intermediate Nasal CrestPLOS ONE · Accessed 2026-10-09Comparative anatomy, mature paddle-shaped Brachylophosaurus crest, Campanian stratigraphy, crest growth and indeterminate B.goodwini treatment inspected. · Inspected: page
- LeonardoGreat Plains Dinosaur Museum and Field Station · Accessed 2026-10-09Complete museum specimen account inspected: skin impressions, muscled neck, keratinous beak, dorsal soft-tissue projections and mitten-like hands. Its unqualified last-meal/parasite statements are not adopted as certain. · Inspected: page
- Brachylophosaurus, Dino DirectoryNatural History Museum, London · Accessed 2026-10-09Complete indexed institutional profile inspected for 7 m reference estimate and herbivory; profile 89–88 Ma age is not adopted because the inspected 2015 research places relevant material in the Campanian. Direct fetch failed. · Inspected: excerpt
- Guenther (2009), Influence of Sequence Heterochrony on Hadrosaurid Dinosaur Postcranial DevelopmentThe Anatomical Record · Accessed 2026-10-09Published article inspected for its abstract and specimen-sourcing comparison: Brachylophosaurus juveniles from bonebeds, versus nesting horizons for other study taxa. · Inspected: page
THE STORY IN THE FOSSILS
Evidence behind Brachylophosaurus
The nasal crest changes with growth, making maturity important when comparing hadrosaurs. A smaller crest need not automatically identify a separate species. [1]
Leonardo’s skin preserves details usually missing from a skeleton. Its soft-tissue outline cautions against tracing the living neck tightly along the vertebrae. [2]
A note on scale and time
The dossier identifies the scope of each reference estimate. A mount, an individual fossil and a species-wide adult range are different measurements. Comparison metrics remain unavailable where adult scope has not been established. Unknown does not mean zero.
Sources & editorial notes
Sources support the stated claims and scopes. Refer to the evidence notes for uncertainty.
- Freedman Fowler and Horner (2015), A New Brachylophosaurin Hadrosaur with an Intermediate Nasal CrestPLOS ONE · Accessed 2026-10-09Comparative anatomy, mature paddle-shaped Brachylophosaurus crest, Campanian stratigraphy, crest growth and indeterminate B.goodwini treatment inspected. · Inspected: page
- LeonardoGreat Plains Dinosaur Museum and Field Station · Accessed 2026-10-09Complete museum specimen account inspected: skin impressions, muscled neck, keratinous beak, dorsal soft-tissue projections and mitten-like hands. Its unqualified last-meal/parasite statements are not adopted as certain. · Inspected: page
- Brachylophosaurus, Dino DirectoryNatural History Museum, London · Accessed 2026-10-09Complete indexed institutional profile inspected for 7 m reference estimate and herbivory; profile 89–88 Ma age is not adopted because the inspected 2015 research places relevant material in the Campanian. Direct fetch failed. · Inspected: excerpt
- Guenther (2009), Influence of Sequence Heterochrony on Hadrosaurid Dinosaur Postcranial DevelopmentThe Anatomical Record · Accessed 2026-10-09Published article inspected for its abstract and specimen-sourcing comparison: Brachylophosaurus juveniles from bonebeds, versus nesting horizons for other study taxa. · Inspected: page
KEEP EXPLORING
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