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hypacrosaurus: herbivore dinosaur from the Cretaceous era

Hypacrosaurus Facts

Pronunciation: HIGH-pack-row-SORE-us

Name meaning: Near the top lizard

Diet	Herbivore
Height	2.5m
Length	9m
Weight	4 tonnes
Environment	Land
Era	Cretaceous
Period	Late Cretaceous
Type	Ornithopod
Location	Canada And United States

Hypacrosaurus was a large ornithopod dinosaur that lived during the Late Cretaceous period, between 75 and 69.5 million years ago. This impressive herbivore roamed the ancient landscapes of what is now Alberta, Canada, and Montana, United States, representing the last of the hollow-crested duckbill dinosaurs known from good remains in North America.

Standing about 2.5 metres tall at the hip and measuring up to 9 metres in total length, Hypacrosaurus was similar in appearance to its relative Corythosaurus but had its own distinctive features. The most notable characteristic was its tall, hollow, rounded crest on top of its head, though this was not as large or as straight as that of Corythosaurus. This crest likely served multiple purposes, including sound production for communication and species recognition.

As an ornithopod, Hypacrosaurus was well-adapted for a herbivorous lifestyle. It possessed the typical duckbill dinosaur features, including a broad, flattened snout and hundreds of small teeth arranged in dental batteries for efficiently grinding tough plant material. The dinosaur could move both on two legs when running and on all fours when feeding, making it highly versatile in its behaviour.

Hypacrosaurus remained a relatively obscure genus until remarkable discoveries in the 1990s revealed nests, eggs, and hatchlings belonging to H. stebingeri. These finds provided unprecedented insights into the early life and nesting behaviour of these fascinating dinosaurs, making Hypacrosaurus one of the best-understood duckbill dinosaurs in terms of reproduction and development.

What made Hypacrosaurus distinctive?

Hypacrosaurus had a distinctive tall, hollow, rounded crest on its head that was smaller and less curved than that of Corythosaurus. It possessed the characteristic duckbill snout of hadrosaurs and could walk on both two and four legs.

Behaviour

Hypacrosaurus built ground nests where females laid their eggs, with evidence suggesting parental care of hatchlings. The hollow crest likely produced sounds for communication between individuals, possibly for mating calls or warning signals within herds.

Fun Facts About Hypacrosaurus

Hypacrosaurus is the latest-surviving hollow-crested duckbill dinosaur known from good fossil remains in North America
The discovery of Hypacrosaurus nests in the 1990s included some of the best-preserved hadrosaur eggs and babies ever found
Hypacrosaurus hatchlings had proportionally larger eyes and shorter crests compared to adults
The hollow crest of Hypacrosaurus contained complex nasal passages that could have produced different musical notes
Some Hypacrosaurus specimens show evidence of seasonal migration patterns based on bone growth analysis

Scientific Classification

Phylum	Chordata
Class	Ornithischia
Family	Hadrosauridae
Genus	Hypacrosaurus

Discovery

Hypacrosaurus was first described by Barnum Brown in 1913. The original fossils were discovered at Alberta, Canada.

Hypacrosaurus FAQ

What did Hypacrosaurus eat?

Hypacrosaurus was a herbivore that fed on various plants including ferns, conifers, and flowering plants. It used its broad duckbill snout to strip vegetation and hundreds of small teeth to grind tough plant material efficiently.

How big was Hypacrosaurus?

Hypacrosaurus was about 2.5 metres tall at the hip and up to 9 metres long from nose to tail. It weighed approximately 4 tonnes, making it a large but not gigantic dinosaur compared to some of its contemporaries.

When did Hypacrosaurus live?

Hypacrosaurus lived during the Late Cretaceous period, approximately 75 to 69.5 million years ago. This makes it one of the last hollow-crested duckbill dinosaurs before the mass extinction event.

Where was Hypacrosaurus found?

Hypacrosaurus fossils have been discovered in Alberta, Canada, and Montana, United States. The first specimens were found in Alberta, with important discoveries including nests and eggs found in both locations.

How do you pronounce Hypacrosaurus?

Hypacrosaurus is pronounced HIGH-pack-row-SORE-us, with emphasis on the first syllable 'HIGH' and the final 'SORE' syllable.

What does Hypacrosaurus mean?

Hypacrosaurus means 'near the top lizard' in reference to its distinctive head crest. The name reflects the prominent hollow crest that sat atop its skull.

How fast could Hypacrosaurus run?

The exact running speed of Hypacrosaurus is unknown, but as a large ornithopod dinosaur, it could likely reach moderate speeds when necessary, though it probably spent most of its time moving slowly while foraging for plants.

What type of dinosaur was Hypacrosaurus?

Hypacrosaurus was an ornithopod dinosaur, specifically a member of the hadrosauridae family known as duckbill dinosaurs. It was a large, herbivorous dinosaur with a distinctive hollow crest.

Was Hypacrosaurus related to birds?

As an ornithischian dinosaur, Hypacrosaurus was not directly ancestral to modern birds. Birds evolved from theropod dinosaurs, which belonged to a different major group called saurischians.

How many Hypacrosaurus fossils have been found?

Multiple Hypacrosaurus specimens have been discovered, including two recognised species. The most significant finds came in the 1990s with the discovery of nests, eggs, and hatchlings, providing remarkable insight into their life cycle.