Polyphase Avatron

The Polyphase Avatron  was a robotic parrot owned by the Captain, who considered it his only true friend. It attacked by engaging a lift-off sequence before flying and killing its target. It would attack anyone who displeased its master. The Captain sent it to attack K9 who destroyed it. The Fourth Doctor returned the broken Avatron to the Captain. (TV: The Pirate Planet)

Behind the scenes
Avatron's energy weapon discharged from under its tail - where a non-robotic bird would typically defecate.