Deer most certainly look up. They have that weird "6th sense" and just seem to know when something bad is about to go down.

I nailed a small 4 pointer a few weeks ago with my bow from up in my treestand. The little guy looked right at me and did the little "bobbin' head doll" move, and stomped his hoof. I stood there frozen and even shut my eyes (deer can even see the whites of your eyes too!), thinking that it's game over, and I'm busted. But the little guy put his head down to eat more acorns and looked away - that's when I went to full draw and nailed him.

But I will never forget the moment when he looked right up at me. I swear, it was like he didn't just look at me, he looked right into my soul! [&:]

Trust me, deer do look up. They are very wary and very intelligent animals. Anyone who thinks otherwise, well... maybe they haven't been in the woods that much.