...but it's still ducking. IMO - if it's jumping, it's going in an upward motion. If it's ducking, it's going in adownward motion.

So... if you have an incredibly slow bow, and a really high strung deer, and a long shot - it IS possible to have a deer actually "Jump" out of the way of an arrow.

Just in the interest of being accurate, saying "jump" is incorrect.

Obviously, it's preloading the legs to "jump" a fraction of a second later. Any deer has to duck before it can jump. Simple physics. However, with the speed of most bows, the deer hasn't had a chance to "rebound" by the time the arrow makes impact (or flies over its back).

So, I think you're very accurate in saying that it "ducked" the shot. If it had actually jumped, the arrow would have went under the target, not over it.

It sounds kinda stupid to say "I shot at a deer, and it jumped, so I shot over it."
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Back on topic, I've shot a couple bedded deer with my bow, and they pretty much just laid there and I pinned them through the vitals. No jump. No duck. No nothing. Then again, they weren't looking at me, so they weren't alert or anything.