Actually, that's quite an interesting thought. I personally haven't seen deer interact w/ any other animals, only other deer. And I think they are "familiar" faces to them. I think they recognize each other. Which is why a tarsal gland from a buck shot from afar will sometimes draw in another buck.....he knows it's a deer, but one he doesn't recognize.

You MAY be able to get away w/ it if you were wearing a whitetail "costume", but I wouldn't bet on it. I think the reason deer will watch a hiker or biker stroll by is specific to the deer living on that piece of ground. Try that anywhere else and I promise they won't stick around. They've just learned that humans aren't a threat, there. I've seen deer spook at a leaf blowing past. I simply don't believe they will tolerate ANYTHING walking toward them. MAYBE the cow "costume" would work in a pasture where there are other cows, but I've never seen deer in the same vicinity.