Struthiomimus

The Struthiomimus was an ostrich-like dinosaur (which was the meaning of its name). The species flourished 75000000 years before the 20th century. Their physiology was adapted to stealing the eggs of other creatures for food and running away at speed, though they had to fear other predators, such as Allosaurs. Stepping out of the TARDIS, the Fourth Doctor once witnessed a Struthiomimus stealing an egg from the nest of a Pteranodon which subsequently threatened the Doctor. (PROSE: The Doctor Who Dinosaur Book)