Deer have a distinctive smell and our brains are geared to remember things like that. I knew the other day there was a deer somewhere along a stretch of corn along a road I was driving. Happened to be in my daughters convertable. Sure enough and typically, when I came up to the cross roads and stopped a deer was right there, almost close enough to touch. I knew it a good 1/2 mile before. Something was right. My brain was talking and since it's almost always on hunting...
Of all the places to be this big doe decided to hang out where it could be clocked by vehicals from both directions. Go figure.