Ostrich

The ostrich was a large, flightless bird native to Earth. It became extinct in 2051. (REF Doctor Who: Monsters and Villains) By the year 5 billion, all that remained of this species was an egg in the possession of Lady Cassandra. Myths had also spread that the ostrich had a 50-foot wingspan and could shoot fire out of its nostrils. (DW: The End of the World)