Hunting Help?

I was in the woods yesterday at about 7:00 and I heard rustling in those small pine tree bushes. About 3 feet tall. The only thing was, the bushes didn't move. I DIDNT SEE ANYTHING. I've seen rabbits out there before buyt i was "bamboozled" for like 15 minutes. I gave up because the sounds were more distant + it was dinner time :] What were they?