Deer do look up, see it all the time. I've actually seen a buck purposely wrap his antlers in some briars while on his hind legs to snatch them down.
They do know when something is out of place on many occassions
I'm a firm believer in the UV theory though. I'm not saying they can't see colors, many berries or poisons in nature are brightly colored.
Last edited by Ferguson Outfitters; 05-19-2014 at 02:11 PM.