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Pachycephalosaurus

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Illustration of Pachycephalosaurus, a dinosaur from the late Cretaceous period.

Pachycephalosaurus

Pachycephalosaurus was a special kind of dinosaur that lived a very long time ago, about 66 million years ago. It lived in places that are now called Montana, South Dakota, Wyoming, and Alberta. Its name means "thick-headed lizard" because it had a very thick skull on top of its head.

This dinosaur walked on two legs and ate plants. It had long, strong legs and small arms. The most interesting thing about Pachycephalosaurus is its big, round dome on its head. This dome was very thick and helped protect its brain. Scientists found fossils and learned a lot about this dinosaur.

Pachycephalosaurus was one of the last dinosaurs living before a big change happened on Earth. Even though some people thought other names like Tylosteus or Stygimoloch were different dinosaurs, scientists now think they might just be young Pachycephalosaurus. This dinosaur is famous for its cool, thick head and is one of the best-known plant-eating dinosaurs from its time.

Images

Fossil skull of Pachycephalosaurus, a type of dinosaur from the late Cretaceous period.
A fossil skull of Pachycephalosaurus, an ancient dinosaur, displayed at the American Museum of Natural History.
Fossilized skull of Pachycephalosaurus, a type of dinosaur that lived millions of years ago.
A chart comparing the size of the dinosaur Pachycephalosaurus to a person, showing how big this ancient creature was during the Cretaceous period.
Illustrated reconstructions of pachycephalosaur dinosaurs from the Hell Creek formation.
Skulls of Pachycephalosaurus dinosaurs showing growth from juvenile to adult, displayed at the Museum of the Rockies.
Scientific comparison showing how the skull of Pachycephalosaurus, a dome-headed dinosaur, changed as it grew from a young dinosaur to an adult.
A comparison showing how big the dinosaur Pachycephalosaurus was compared to a person.
Illustration showing how Pachycephalosaurus dinosaurs may have interacted by gently bumping heads.
Illustration of Pachycephalosaurus, a dinosaur from the late Cretaceous period.
A scientific model showing the brain structure of Pachycephalosaurus, a dinosaur that lived millions of years ago.
A scientific illustration of Stegoceras validum, an ancient dinosaur from the late Cretaceous period.

Related articles

Dinosaur
Montana
South Dakota
Wyoming
Alberta
Skull

This article is a child-friendly adaptation of the Wikipedia article on Pachycephalosaurus, available under CC BY-SA 4.0.

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