Cobblemouse
From Tardis Wiki, the free Doctor Who reference
A cobblemouse was an animal native to Gallifrey.
Biology
When they matured, cobblemice grew wings. (PROSE: Unnatural History)
History
The First Doctor once let a cobblemouse loose in the House of Lungbarrow and interupted the plans that his father and Mr Saldaamir were making. (PROSE: Unnatural History)