EXHIBIT 05
Parasaurolophus walkeri
A hollow crest and a skeleton that records an injured animal's life.
TWO WAYS TO PICTURE THE PAST
Compare the evidence with the familiar movie image. The illustrations are not to a shared scale.
The elongated hollow crest follows P. walkeri skull anatomy. The broad neck is compatible with a proposed reconstruction of the nuchal ligament, a neck-support structure; its exact form remains debated. Skin impressions inform a scaly surface, but this full-body pattern, colors and precise soft-tissue outline are interpretations. The injured holotype does not define every healthy individual. [3] [1] [5]
Life reconstruction of Parasaurolophus walkeri — Connor Ashbridge. CC BY-SA 4.0. Resized and converted to WebP; complete composition retained.
A crest-bearing animal posed upright for a dramatic encounter. This pose is an artistic choice, not evidence of a habitual stance. The slender neck, pronounced surface details and lighting differ from the fleshed scientific reconstruction. [3] [2]
Original artwork · artistic interpretation.
Scientific view: credited paleoart interpreting fossil evidence. Movie-style view: Original artwork. Colors and many soft tissues are uncertain.
MEET THE ANIMAL
Parasaurolophus walkeri was a rare plant-eating dinosaur from Late Cretaceous Alberta. Its most striking feature was a long crest projecting behind the head. The crest was not simply a solid spike: winding nasal passages ran through it. These internal spaces make the skull useful for investigating how the animal might have produced sounds, as well as how it looked. [D1]
A famous specimen called ROM 768 provides the familiar species outline, but the skeleton is incomplete. Estimating its total length requires restoring missing parts rather than measuring an entire preserved body. An incomplete skeleton can still be useful, as long as a reconstructed size is identified as an estimate for that individual rather than every adult. [D2]
The Royal Ontario Museum describes the hollow crest as a possible resonating chamber for calls. Resonance is the way a space affects a sound's vibration; the proposal is not a recording of the animal's actual voice. Different crest forms could also help animals recognize their own species. A genus-level museum reconstruction allows two-legged and four-legged postures, while a specific gait or detailed social routine needs separate evidence. [S1] [D4]
PREHISTORIC ANIMAL DOSSIER
The animal, the evidence, and the questions still open.
Parasaurolophus walkeri is the rare Albertan species with a long, hollow crest. Its famous type skeleton is incomplete, and crest-based communication remains an anatomical interpretation.
Profile scope: Species — Parasaurolophus walkeri
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.
About 9.45 m (ROM 768 reconstruction)
Farke and colleagues quote an earlier estimated total length for this P. walkeri specimen. It is an incomplete-skeleton reconstruction, not a direct whole-body measurement or adult population range. [D2]
Not established here
A mass estimate specifically reviewed for P. walkeri is not established here; genus-level estimates are not substituted.
Plant eater
Alberta Parks explicitly lists P. walkeri as herbivorous. The reviewed species-level source does not establish particular food plants. [D3]
Late Cretaceous Alberta
The museum identifies P. walkeri as the rare Albertan species. This regional occurrence does not establish a specific habitat preference. [D1] [D3]
Probably four-legged, with two-legged capability
The museum describes both postures for Parasaurolophus at genus level. Applying that reconstruction to P. walkeri is comparative context, not a species-specific gait test. [D4]
Long crest with looping nasal passages
Hollow winding passages characterize the crest. Resonance and visual signaling are functional hypotheses, rather than a recovered call. [D1]
Not established here
Reviewed sources do not establish P. walkeri nest architecture, clutch size or parental care.
Crest signaling possible; courtship unverified
Crest display and sound are proposed at genus level. The reviewed museum account cautions against treating differing species' crests as demonstrated male/female forms. [D1]
Not established here
Reviewed sources do not establish P. walkeri group size or coordinated social behaviour.
Sources and inspection notes for the claims in this profile.
THE STORY IN THE FOSSILS
Parasaurolophus walkeri’s type specimen, ROM 768, was discovered in Alberta in 1920 and described by William Parks in 1922. Most of its tail and hindlimbs are missing; the left femur is preserved. Parks reported tuberculated skin impressions but cautioned that these samples could not establish the skin pattern over the entire animal. [1] [3]
The backward-projecting crest contains looping nasal passages. Acoustic models have been published for ROM 768, but they estimate resonance rather than recover P. walkeri’s actual call. Visual display is also a proposed crest function. Alberta Parks lists P. walkeri as a herbivore; its precise food choices remain inferred. [6] [3] [4]
A modern study of ROM 768 documented healed rib fractures, abnormal growth around backbones and a dental lesion. Researchers interpreted much of the damage as trauma. The gap between two back spines is interpreted as injury-related, rather than a standard notch for receiving the crest. [3]
We have not established a comparable adult total-length estimate for this taxon in this draft. Specimen measurements in the text describe those individuals. A numerical age interval has not been reviewed here. Unknown does not mean zero.
Sources and evidence notes for this exhibit.
KEEP EXPLORING
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