Dragon

Dragons were creatures from Earth myths and legends, resembling giant lizards.

The Doctor encountered a fire-breathing dragon in the forest outside the Pied Piper's castle, but drove it off with a fire extinguisher. (TVC: Challenge of the Piper)

Senator Alcott's fear of the Chinese manifested itself as a Chinese dragon. (DW: The Mind of Evil)

Dragons were one of the life-forms found on Avalon. (MA: The Sorcerer's Apprentice)

The dragon of Iceworld was a biomechanoid assigned to keep the Dragonfire away from Kane. (DW: Dragonfire)