But, being a CA boy myself, I found that having a Wisconsin girlfriend works wonders. She has radar for deer, aka 'deer-dar' that sees deers in the roads about 5 seconds before I do. I guess it's just practice.
My wife also has that radar like capability. Only its effectiveness is reduced considerably becuase it's non-directional.
Wife: DEER!!
Me: Where?
Wife: Over there!
Car: Sreeching brakes...
Me: sigh....