Dinosaurs' are a diverse group of reptiles that were the dominant terrestrial vertebrates for over 160 million years, from the late Triassic period (about 230 million years ago) until the end of the Cretaceous (about 66 million years ago). The extinction of most dinosaur species occurred during the Cretaceous–Palaeogene extinction event. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic period. Some of them survived the Cretaceous–Palaeogene extinction event, those survivors being the ancestors of all modern birds. Consequently, in modern classification systems, birds are considered a type of dinosaur as they are related to bird-like dinosaurs such as Velociraptor, Troodon, Oviraptor, etc.— they are the only group that survives to the present day. Dinosaurs became extinct when a giant asteroid fell on earth 66 million years ago.

Fossils and skeletons (examples)

• 
  Triceratops skeletal mount
• 
  Spinosaurus skeletal mount
• 
  Archaeopteryx skeleton, preserved with feather impressions
• 
  Giraffatitan, Berlin Naturkundemuseum.
• 
  Tyrannosaurus (named "Sue"), FMNH.
• 
  "Fighting Dinosaurs" Protoceratops and Velociraptor.
• 
  Stegosaurus vs. Allosaurus, Denver Museum of Nature and Science.
• 
  Gargoyleosaurus, Denver Museum of Nature and Science.
• 
  Compsognathus fossil.
• 
  Microraptor, with preserved feather impression
• 
  Amargasaurus skeletal mount
• 
  Citipati fossil
• 
  Scutellosaurus skeletal mount
• 
  Tenontosaurus and Convolosaurus skeletal mounts
• 
  Deinocheirus skeletal mount
• 
  Tarbosaurus and Saurolophus skeletal mounts
• 
  Coelophysis skeletal mount
• 
  Oviraptor fossil
• 
  Borealopelta fossil with preserved skin impressions
• 
  Ceratosaurus and Dryosaurus skeletal mounts
• 
  Psittacosaurus fossil with preserved quill impressions

Eggs

• 
  Eggs of dinosaur in Museum of Earth in Kletno (Lower Silesia, Poland)
• 
  Fossilized dinosaur eggs in the Museum of National History in Ulaanbaatar
• 
  Clutch of round eggs named Oolithes spheroides, Location: Senckenberg-Museum, Frankfurt am Main

Models and statues

• 
  Heterodontosaurus.
• 
  Edmontonia.
• 
  Psittacosaurus.
• 
  Albertosaurus.
• 
  Vulcanodon.
• 
  Antarctopelta
• 
  Deinonychus with feathers
• 
  Crystal Palace Iguanodon

Other

• 
  K-PG boundary