Ecidien Cerebus Bird
From Tardis Wiki, the free Doctor Who reference
Ecidien Cerebus Bird was an inhabitant of Ecidius IV. At some point, it was transported to the Doctor's TARDIS where Romana II and K9 Mark II found it. (AUDIO: The Pursuit of History)
When the Fourth Doctor's mind was wiped, it came from the TARDIS and restored the Doctor's memory. (AUDIO: Casualties of Time)
