Does anybody know how to make a microphone activate a servo?

My dad and I are wondering if anyone knows how to activate a servo by using a microphone. We are making some animated duck decoys (motion decoys) and came up with this idea.
LEGO

Look up "VOX circuit" or "Sound activated switch" via Google or other search engine. This would be your "switch" for the servo control mechanism. Then look up "Servo Controller circuit". AaronCake.net has a very simple 555 timer control for servos, but you have to confirm if it would work with yours.

Ultimately, you have to decide how you want the servo to be controlled after the "sound" triggers activation. You may want a micro controller to send the correct signals to the servo once activated.

Good luck with your ducks,
Qa
Look for "sound activated switch" circuits.
yep.