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11 / Mesozoic
Parasaurolophus
Parasaurolophus walkeri
Its long hollow crest may have carried low calls across forests and floodplains.
- Time range
- About 76–73 million years ago
- Final stage
- Late Cretaceous
- Geographic range
- North America
01 / ANSWER FIRST
What was Parasaurolophus?
Parasaurolophus was a large crested hadrosaur from Late Cretaceous North America whose long hollow nasal crest probably combined visual display with low-frequency sound production.
Air passages ran from the nostrils through the crest and back into the skull. CT models can calculate resonances, but no fossil records the larynx, soft tissue or actual call, so audio demonstrations are hypotheses rather than recordings.
02 / QUICK FACTS
Parasaurolophus at a glance
- Scientific name
- Parasaurolophus walkeri
- Age
- ~76.5–73 million years ago
- Length
- About 9–10 m
- Mass
- Roughly 2.5–4 tonnes
- Crest
- Hollow nasal tubes
- Diet
- Herbivorous
- Locomotion
- Bipedal and quadrupedal
- Range
- Western North America
03 / CORE QUESTION
What did the crest sound like?
CT scans map the looping nasal passages and allow researchers to model resonant frequencies, generally favouring low calls. Longer adult crests would resonate differently from shorter juvenile crests.
Resonance does not reveal the exact source sound, volume or rhythm. The crest was also visually conspicuous and varied by species and growth stage, making combined communication and recognition more plausible than a single function.
Read the complete crest and sound guideHow to read the numbers
This page separates direct evidence, comparative inference and unresolved debate.
04 / LIFE & DISCOVERY TIMELINE
A hollow crest that grew with its owner
Coastal-plain herds
Parasaurolophus feeds among rivers and forests.
Holotype discovered
A skull and skeleton emerge in Alberta.
Genus named
William Parks describes the long-crested hadrosaur.
Airway modelled
Digital scans test resonance and growth.
05 / ANATOMY
A dental processor crowned by an acoustic tube
Hollow crest
Paired nasal passages looped through a metre-scale tube.
Dental battery
Hundreds of replacement teeth formed broad grinding surfaces.
Flexible stance
Strong hind limbs and weight-bearing hands allowed two- or four-legged movement.
Skin impressions
Scaly body outlines constrain the torso and tail.
06 / DIET & BEHAVIOUR
What did Parasaurolophus eat?
Its beak cropped plants while dental batteries shredded leaves, twigs and other vegetation from low to moderate height.
Read the complete guide07 / DIET & BEHAVIOUR
Did it live in herds?
Hadrosaur bonebeds and tracks support social aggregation broadly, but Parasaurolophus herd size and organisation are not directly measured.
08 / RANGE & HABITAT
Where did Parasaurolophus live?
Species are known from Alberta, Utah and New Mexico in river-rich coastal plains along the Western Interior Seaway.
Alberta
P. walkeri preserves the classic long crest.
Utah
P. cyrtocristatus broadens southern distribution.
New Mexico
P. tubicen preserves detailed crest anatomy.
Coastal plains
Forests, channels and wetlands supplied vegetation.
09 / FOSSIL EVIDENCE
How do scientists know about Parasaurolophus?
Skulls
Complete crests reveal nasal passage geometry.
CT scans
Digital airways support resonance tests.
Juveniles
Small crests document rapid growth and changing proportions.
Skeletons and skin
Posture, scale and body outline constrain reconstructions.
10 / DISAPPEARANCE & DEBATE
Was the crest only a musical instrument?
No. Sound is strongly supported by airway anatomy, while display, species recognition and growth-stage signalling probably worked alongside it.
The fossil determines tube shape, not the living call. Responsible audio presents a model range and names assumptions.
12 / FREQUENTLY ASKED QUESTIONS
Parasaurolophus FAQ
How big was Parasaurolophus?
About 9–10 metres long and roughly 2.5–4 tonnes.
Was the crest hollow?
Yes; looping nasal passages ran through it.
Could it make sounds?
The crest could resonate low frequencies, but the exact call is unknown.
Did it breathe underwater?
No; the crest was not a snorkel.
What did it eat?
A broad range of terrestrial vegetation processed by a beak and dental battery.
Did it walk on four legs?
It could move on both two and four legs.
04 / SOURCES & FURTHER READING
Check the source record
Use the scientific name to compare taxonomy, occurrence records and the fossil record. Database coverage and classifications may differ.
05 / REVISION HISTORY
How has this record changed?
- Expanded into a bilingual S-tier hub with two evidence-led guides.
- Verified authoritative entity sources and added three responsive reconstruction sizes.
- Initial bilingual species record published.
06 / CORRECTIONS & ADDITIONS