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Pachycephalosaurus
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Pachycephalosaurus was a herbivore (plant-eating) dinosaur that
lived during the late Cretaceous period,
about 76 to 65 million years ago,
in North America.
It was one of the dinosaurs that died out in the Cretaceous-Tertiary
extinction,
65 million years ago.
The name Pachycephalosaurus means "thick-headed lizard",
and describes the creature's most noteworthy feature:
the huge 10 inch (25 centimeter) thick
bone dome on its head. At the rear of the dome were a number of bony knobs,
and the animal's snout also possessed several short bony spikes.
This has led most scientists to conclude that the animal was probably
related to the
Ceratopsians
(which include
Protoceratops,
Psittacosaurus,
Styracosaurus
and
Triceratops),
although unlike most
Ceratopsians,
Pachycephalosaurus is believed to have been bipedal.
It was once thought that Pachycephalosaurus would have used the dome
on its head either to engage in butting contests for mates (similar to
modern big-horned sheep), or to defend against predators. However,
it is now believed that this could not have been the case:
the head bones do not appear to be strong enough for such impacts,
the skulls lack shock absorbing features, and there no evidence of
scars or other damage have been found on
fossilized
Pachycephalosaurus skulls.
Another somewhat unusual feature of Pachycephalosaurus is its teeth.
The animal had very small ridged teeth which would have been
far less capable of chewing tough, fibrous plant material than
other herbivorous dinosaurs of the late Cretaceous. It is therefore
thought that perhaps Pachycephalosaurus lived on a diet of
leaves, seeds, fruit and perhaps insects.
So far, only the skull of Pachycephalosaurus has been discovered.
Scientists estimate that the fully grown creature was 15 feet (4.6 meters) long,
and weighed about 950 pounds (430 kilograms).
They have come up with these figures by examining
the skull and extrapolating the likely size on the creature based on
the head-to-body ratios of its close relatives.
Pachycephalosaurus Timeline:
Pachycephalosaurus was a herbivore (plant-eater) that lived from 76 to 65 million years ago
Related Information & Resources
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Pachycephalosaurus Facts
Here is a summary of some of the key facts about Pachycephalosaurus:
- Pachycephalosaurus was a genus of dinosaur.
- "Pachycephalosaurus" means "thick-headed lizard". This name was chosen by Barnum Brown and Erich Maren Schlaikjer in 1943.
- Pachycephalosaurus was a member of the Ornithischia ("bird-hipped") order of dinosaurs. What this means, is that although Pachycephalosaurus was not closely related to birds, it did have similarly shaped pelvic bones.
- Pachycephalosaurus was a Pachycephalosaur - a member of a group of related herbivorous (plant-eating) dinosaurs with bony domes on their heads.
- Pachycephalosaurus lived between about 76 million years ago and 65 million years ago, during the late Cretaceous period.
- Pachycephalosaurus was one of the dinosaurs which died out during the Cretaceous-Tertiary mass extinction at the end of the Mesozoic Era.
- Pachycephalosaurus lived in North America.
- Pachycephalosaurus was a herbivore (plant-eater).
- Pachycephalosaurus was about 15 feet (4.6 meters) long.
- Pachycephalosaurus weighed about 950 pounds (430 kilograms).
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Pachycephalosaurus Books Here are some books from Amazon.com:
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By Rob Shone
PowerKids Press Released: August 30th, 2011 Library Binding (32 pages)
 | Lowest New Price: $30.27* In Stock* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Pachycephalosaurus: The Thick-Headed Lizard (Graphic Dinosaurs)- Manufacturer: Powerkids Pr
- Brand: PowerKids Press
- ISBN: 1448852528
- EAN: 9781448852529
Details:- Product Category: Library Binding
- Number of Pages: 32
- Author: Rob Shone
- Publication Date: August 30th, 2011
- Release Date: August 30th, 2011
Physical Description:- Size: 11.25 inches by 9.5 inches by 0.25 inches
- Weight: 0.85 pounds
Click here for more information |
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By Enrique Fiesta
CREATESPACE Released: January 23rd, 2015 Paperback (54 pages)
 | Lowest New Price: $11.99* In Stock* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Pachycephalosaurus - Thick-Headed Lizard- Manufacturer: CreateSpace Independent Publishing Platform
- Brand: CREATESPACE
- ISBN: 1507686900
- EAN: 9781507686904
- PartNumber: colour illustrations
Details:- Paperback
- Number of Pages: 54
- Authors: Enrique Fiesta, John Davidson
- Publication Date: January 23rd, 2015
- Release Date: January 23rd, 2015
Physical Description:- Size: 9.0 Inches by 6.0 Inches by 0.13 Inches
- Weight: 0.18959754532 Pounds
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By Janet Riehecky
The Childs World Inc Library Binding
 | List Price: $21.36* Lowest Used Price: $6.22* In stock Usually ships within 3 to 4 days.* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Pachycephalosaurus : Dinosaurs Series- Manufacturer: The Childs World Inc
- ISBN: 0895656329
- EAN: 9780895656322
Details:- Product Category: Library Binding
- Author: Janet Riehecky
Physical Description:- Size: 10.5 Inches by 8.5 Inches by 0.5 Inches
- Weight: 0.65 Pounds
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By Chase Coffield
Independently published Released: April 14th, 2023 Paperback (30 pages)
 | Lowest New Price: $10.99* In Stock* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Boris the Pachycephalosaurus- Manufacturer: Independently published
- EAN: 9798386685348
Details:- Paperback
- Number of Pages: 30
- Author: Chase Coffield
- Publication Date: April 14th, 2023
- Release Date: April 14th, 2023
Physical Description:- Size: 11.0 Inches by 8.5 Inches by 0.08 Inches
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By Rebecca Sabelko
Epic Released: August 1st, 2023 Library Binding (24 pages)
 | Lowest New Price: $33.68* In Stock* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Pachycephalosaurus (World of Dinosaurs)- Manufacturer: Epic
- EAN: 9798886875041
- PartNumber: 9798886875041
Details:- Product Category: Library Binding
- Number of Pages: 24
- Author: Rebecca Sabelko
- Publication Date: August 1st, 2023
- Release Date: August 1st, 2023
Physical Description:- Size: 9.25 Inches by 7.75 Inches by 0.5 Inches
- Weight: 0.54895103238 Pounds
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By Virginia Schomp
Cavendish Square Publishing Released: January 30th, 2005 Library Binding (32 pages)
 | Lowest New Price: $32.64* Temporarily out of stock. Order now and we'll deliver when available. We'll e-mail you with an estimated delivery date as soon as we have more information. Your account will only be charged when we ship the item.* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Pachycephalosaurus: And Other Bone-Headed Plant-Eaters (Prehistoric World)- Manufacturer: Cavendish Square Publishing
- Brand: Cavendish Square Publishing
- ISBN: 0761415424
- EAN: 9780761415428
Details:- Product Category: Library Binding
- Format: Illustrated
- Edition: Illustrated
- Number of Pages: 32
- Author: Virginia Schomp
- Publication Date: January 30th, 2005
- Release Date: January 30th, 2005
Physical Description:- Size: 10.24 Inches by 10.14 Inches by 0.43 Inches
- Weight: 0.93916923612 Pounds
Features:- Used Book in Good Condition
Click here for more information |
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By Frances Swann
Brand: Rourke Pub Group Library Binding (24 pages)
 | List Price: $21.93* Lowest Used Price: $7.26* In Stock* *(As of 22:38 Pacific 17 Feb 2025 More Info)
Click Here | Description: Pachycephalosaurus (Dinosaur Library)- Manufacturer: Rourke Pub Group
- Brand: Brand: Rourke Pub Group
- ISBN: 0865925267
- EAN: 9780865925267
Details:- Product Category: Library Binding
- Number of Pages: 24
- Author: Frances Swann
Physical Description:- Size: 10.75 Inches by 7.75 Inches by 0.5 inches
- Weight: 0.65 Pounds
Features:- Used Book in Good Condition
Click here for more information |
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