Flutterwing

Flutterwings were a species of insect native to the planet Gallifrey. Romana I studied their life cycle while at the Time Lord Academy. They likely went extinct when Gallifrey was destroyed at the end of the Last Great Time War. (DW: The Pirate Planet, NA: Set Piece) The Eighth Doctor kept a flutterwing in his TARDIS's butterfly room. (EDA: Vampire Science)


 * It was not specified on-screen what kind of animal the flutterwing was, only in the novel.