How do I identify a bird egg I found?

I have found an egg that is a base color of tan and it has tiny brownish dots and it has bigger dots on it too its about 1 1/4' long. I live in the desert in Palm Springs. Could it be a Road Runner and how do I tell what it is?????!!!!!

Thank You
Alyssa Cazares

if it looks like this... http://weezerbutler.tripod.com/Dscf0004.jpg its a wading bird
this....http://us.inmagine.com/168nwm/foodcollection/fdc005/fdc900275.jpg quail