Squawk
From Tardis Wiki, the free Doctor Who reference
Squawk was a robotic bird from Pharos, who served Baltazar as a spy. His father was Caw, who Squawk later mourned for. Squawk was disguised as a small brooch, given to Martha Jones by Caw. When the TARDIS is hijacked by Baltazar, The Doctor turned Squawk big enough to ride on, and traveled to the Infinite to rescue Martha. Squawk took Baltazar to Volag-Noc, where he belonged. (DW: The Infinite Quest)