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Saurischians

Well-known dinosaurs like the Tyrannosaurus rex, Deinonychus and Velociraptor fall into this order. Saurischians are divided into two groups.

  • Sauropods are four-legged herbivores. They had long heads, long necks and long tails. Leaf-eating Apatosaurus, Brachiosaurus and Diplodocus fall into this family.
  • Theropods are two-legged carnivores. There are some of the most fearsome dinosaurs, including Allosaurus and T. rex.

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Two orders of dinosaurs

In 1842, palaeontologist Richard Owen coined the term dinosaur. The Greek deinos means "terrible," and sauros means "lizard" or "reptile."

Based on the structure of the hipbones, dinosaurs are classified into two orders:

  • Saurischians. These "reptile-hipped" di...

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Dinosaurs: Family tree update

In 2017, a study suggested that this hip-oriented classification was incorrect.

Theropods are likely related to the ornithischian dinosaurs. The theropods and Ornithischia form a newly identified group known as Ornithoscelida. If this is correct, it may explain why both theropods and Ornit...

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Dinosaurs ruled the Earth for 175 million years

Dinosaurs ruled the Earth for 175 million years

Dinosaurs first appeared between 247 and 240 million years ago. An extinction event wiped them out 65,5 million years ago, except for the avian dinosaurs.

Scientists think the extinction was likely because of an asteroid impact, chemicals from erupting volcanoes, climate ...

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Experts believe birds are living dinosaurs

Fossils reveal that some of the more advanced dinosaurs had feathers or featherlike body covering.

  • Archaeopteryx was considered the first bird but probably couldn't fly far.
  • Pterosaurs - extinct flying reptiles - were not dinosaurs although ...

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Ornithischia

Ornithischians include horned and frilled Triceratops, spiked Stegosaurus and armoured Ankylosaurus.

They often lived in herds and were prey to the larger species of dinosaurs.

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Dinosaur feathers

Small structures named melanosomes vary in colour depending on their shape: Black ones are sausage-like, and reds are round. A well-preserved M.guid feather shone raven. Nanostructures also suggest it had an iridescent sheen.

Close relatives to the T. rex have protofeathers on their heads,...

Two orders of dinosaurs

In 1842, palaeontologist Richard Owen coined the term dinosaur. The Greek deinos means "terrible," and sauros means "lizard" or "reptile."

Based on the structure of the hipbones, dinosaurs are classified into two orders:

  • Saurischians. These "reptile-hipped" di...

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