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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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See Also
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).
Pachycephalosaurus Toys
Papo
Toy
 | List Price: $15.99
Lowest New Price: $7.89
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - Papo Toys
- Model Size: 4.5" L x 3.3" H
- Item is sold as single piece
Product Description:
Great for kids. This item is not only a toy, but an educational series of hand painted replicas that reveals the prehistoric world. Each quality molded dinosaur is hand painted and beautifully detailed. |
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WowToyz
Toy
 | Lowest New Price: $11.98
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - Includes educational booklet!
- Authentic Detail
Product Description:
This authentically detailed model of a Pachycephalosaurus is 18-inches long and made of durable plastic. |
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Boley
Toy
 | Lowest New Price: $4.99
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - 10 inches long
- Durable plastic
Product Description:
This authentically detailed model of a Pachycephalosaurus is 10-inches long and made of durable plastic. |
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American Science & Surplus
Misc.
 | Lowest New Price: $10.95
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - It's A Dino Skull, You Dig? Yes, you do dig. And when you're finished digging, chipping, and brushing away the 6" x 5" x 4" plaster/earthen block, you're rewarded with a miniature replica of a skull from a Triceratops, Stegosaurus, Pachycephalosaurus, or a Tyrannosaurus. (We'll pick.) When you're done, mount it on the included wooden stand with a plaque identifying it. Includes a little wood pick and brush.
Product Description:
It's A Dino Skull, You Dig? Yes, you do dig. And when you're finished digging, chipping, and brushing away the 6" x 5" x 4" plaster/earthen block, you're rewarded with a miniature replica of a skull from a Triceratops, Stegosaurus, Pachycephalosaurus, or a Tyrannosaurus. (We'll pick.) When you're done, mount it on the included wooden stand with a plaque identifying it. Includes a little wood pick and brush. |
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Holztiger
Toy
 | Lowest New Price: $9.89
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - Age: 3+
- Measurements: length 6 x width 2 inches x depth 0.9 inches
- Made in Germany
Product Description:
Holztiger Dinosaurs make sure that playing and learning stimulates a child`s imagination, the forms of the figures are reduced to the minimum. The results are timeless and beautifully stylized wooden animals, which allow a child`s imagination to develop fully while playing and having fun. So when you buy a wooden toy made by HOLZTIGER, you can be sure that it is not only durable and ecologically sound, but that it also meets the highest quality requirements. |
|
Boley
Toy
 | Lowest New Price: $29.98
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - Contains a variety of 12 dinosaurs
- Authentic Detail
Product Description:
This 12-piece set is a great way to collect our full line of 10-inch dinosaurs. This set offers an awesome authentic variety of lots of popular dinosaurs including: Tyrannosaurus Rex, Ceratosaurus, Pachycephalosaurus, Triceratops, Parasaurolophus, Pinacosaurus, Dimetrodon, Allosaurus, Dilophosaurus, Barosaurus, Stegosaurus, Deinonychus. |
|
Papo
Toy
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(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | Product Description:
Allosaurus |
|
Definitely Dinosaurs - The Biggest Kind of Fun
Toy
| Lowest New Price: $42.99
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | - Poseable legs
- Dinosaur and Cavester figures
Product Description:
A caveman and dinosaur set in a window box from Playskool, one of a series. This has a 10 inch long Pachycephalosaurus and "Reeve" the caveman(3.5 in tall). Box is 10 x 7 x 3 in and contains a storybook. |
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Pachycephalosaurus Books
By Fabio Marco Dalla Vecchia
Blackbirch Press
Library Binding (32 pages; 1)
 | List Price: $23.70
Lowest New Price: $12.50
Lowest Used Price: $7.00
Usually ships in 24 hours
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
|
By Michael P. Goecke
Buddy Books
Library Binding (32 pages; 1)
 | List Price: $24.21
Lowest New Price: $9.99
Lowest Used Price: $9.00
Usually ships in 24 hours
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
|
By Frances Freedman
Gareth Stevens Publishing
Library Binding (24 pages; 1)
| List Price: $19.93
Lowest New Price: $30.82
Lowest Used Price: $0.62
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
|
By Frances Swann
Rourke Pub Group
Library Binding
| List Price: $21.93
Lowest Used Price: $0.79
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
|
By Janet Riehecky
Childs World
Hardcover
| Lowest Used Price: $39.86
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
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By Janet Riehecky
Childs World
School & Library Binding (32 pages)
| List Price: $21.36
Lowest New Price: $34.21
Lowest Used Price: $15.00
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
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By Virginia Schomp
Benchmark Books
Hardcover
| Lowest Used Price: $39.86
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
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By Janet Riehecky
Childs World
School & Library Binding (32 pages; 1)
| List Price: $21.36
Lowest New Price: $7.65
Lowest Used Price: $0.01
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here | Product Description:
Presents known and hypothesized information about the dinosaur Pachydephalosaurus, including its discovery, physical appearance, and lifestyle. |
|
By Daniel Cohen
Capstone Press
Paperback (24 pages; 1)
| List Price: $6.95
Lowest New Price: $1.46
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Usually ships in 24 hours
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Click Here |
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By Virginia Schomp
Benchmark Books (NY)
Library Binding (32 pages; 1)
| List Price: $29.93
Lowest New Price: $8.95
Lowest Used Price: $0.01
Usually ships in 24 hours
(As of 13:28 Pacific 3 Jul 2009 More Info)
Click Here |
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