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This Vulture would would to Walt's
Guests via Wally Boag from the back.
A mic is hanging from the center of the light.  That way cast members could listen and interact with them via the "Vulture". 
The Trophy Room was designed as sort of an inside joke with Walt.  He actually did not like to go hunting and did not like animals that were killed and mounted on walls.  As a joke, many of his friends sent him mounted animals to put into the room that was named "The Trophy Room".  This room no longer houses functional hidden mics or speakers.  The primary intention of the mics and talking Vulture was not to spy on the guests dining but to entertain them.  Wally Boag (performer from "Golden Horseshoe Revue") would converse with guests via the audio-animatronic vulture.

When you enter the room look straight ahead at the China Cabinet on the far wall.  There is a round hole at the top of the cabinet.
That hole was intended to house a hidden camera....but it never actually did.
China Cabinet