Dinosaur

Dinosaurs were a group of animals that were found on Earth from approximately 230 million years ago to 65 million years ago. They were wiped out at the end of the Cretaceous period when a space freighter filled anti-matter crashed into Earth. (DW: Earthshock)



Types of Dinosaurs
Though there were many millions of species of dinosaurs (TDA: The Last Dodo), the Doctor has only encountered a few species in his travels.
 * Apatosaurus (DW: Invasion of the Dinosaurs)
 * Megalosaurus (TDA: The Last Dodo)
 * Stegosaurus (DW: Invasion of the Dinosaurs)
 * Triceratops (DW: Invasion of the Dinosaurs)
 * Tyrannosaurus rex (DW: Invasion of the Dinosaurs, The Mark of the Rani, DWM: ''Hotel Historia)
 * An unidentified Theropod in a Silurian cave (DW: Doctor Who and the Silurians)

Similar Creatures
On many other planets, creatures similar to the dinosaurs of Earth evolved.

Mondas dinosaurs
The planet Mondas, Earth's twin planet, also had dinosaur species at one stage of its development. At an early point in their history, the Mondasian Cybermen partially cyber-converted dinosaurs and on some occasions, used them as mounts. (DWM: The Cybermen)

Gallifreyan dinosaurs
The planet Gallifrey had dinosaur-like species called Gargantosaurs. (DWM: The Stolen TARDIS)

Skarosian dinosaurs
The planet Skaro was also home to creatures that resembled dinosaurs, specifically the Triceratops but with only one horn. Normally peaceful herbivores, they would attack Daleks on sight. The Doctor and Finney used a herd of these to destroy a group of Daleks that had taken them to Skaro. (TVC: The Planet of the Daleks)

Spidron dinosaurs
The home world of the Spidrons was another planet inhabited by dinosaur-like creatures. One of these resembled a pterodactyl, which attacked the Doctor shortly after he arrived on its world. Another, a tyrannosaur-like creature, stepped on some Spidrons that were pursuing the Doctor and Arnold. (TVC: Nova)

Dinosaur-like creatures
There were many creatures living around the time of the dinosaurs, some appearing in Doctor Who,these were the pterodactyls, a group of flying reptile-like mammals.
 * Some pterodactyls of unknown species attacked The Doctor (DW: Invasion of the Dinosaurs).
 * Myfanwy was a pterodactyl, identified as a pteranodon, he came through the Cardiff rift and appeared in various Torchwood episodes.

Minor references

 * The Doctor hoped to see "prehistoric monsters" (which implies dinosaurs). (DW: The Underwater Menace)
 * Operation Golden Age, which had brought dinosaurs to the 20th century, was brought up on a number of occasions. The newly regenerated fourth incarnation did so (DW: Robot), as did the Doctor later in his seventh incarnation, to Ace, to the latter's awe. (DW: The Happiness Patrol) Sarah Jane Smith would also later boast of this incident to Rose Tyler. (DW: School Reunion)
 * Donna Noble suggested that dinosaurs lived at the centre of the Earth. (DW: The Runaway Bride)
 * At some point in his life, Jack Harkness had to survive on the carcasses of dinosaurs, since they were the only source of cooked meat after an asteroid hit. (TW: Fragments)
 * ''Since the K-T extinction was actually caused by a crashed freighter, instead of an asteroid, he may have been referring to an early asteroid collision.