What makes your stomach growl??

Sera recently asked me this one and i have always wondered it and never knew so i thought hey I'll look it up!

borborygmi is the word for the sound that it makes which is an onomatopoeia (meaning the word sounds like what sound it makes) if you follow the link you can hear the pronunciation of the word!
http://www.merriam-webster.com/cgi-bin/audio.pl?borbor02.wav=borborygmi

It happens when your stomach walls squeeze together in an attempt to mix and digest food and there's no food there. Gases and digestive juices slosh around in your empty stomach and make this sound!
It doesn't only happen when you are hungry though. It is a normal part of digestion especially if your stomach is not digesting the food right! also a lot of times you do not feel it or hear it when your stomach has food it in!

Basically Your stomach is constantly digesting and if there is nothing in their to digest you hear the sound of it sloshing around the digestive juices and such to try and digest things!

Here are some links you can read more about this!
http://www.coolquiz.com/trivia/explain/docs/stomach.asp
http://www.sciam.com/article.cfm?id=why-does-your-stomach-gro
http://en.wikipedia.org/wiki/Borborygmus

And if you have any random things you would like me to look up i would love to hear them!