Sylvan has made some good points, I think all hunters would benefit from a good anatomylesson. Another point is that topographical anatomy (where things are located in a standing deer in relation to external landmarks)is much different than a dead deer laying on its back being field dressed. Every hunter should look at theorgans andwhere they hit them, then look in the cavity of the deer andsee where the holes are and relate this back to where theentry and exit wounds are. A fewminutes with a dead deer can teach you a lot.I think the most common mistake is that the actual chest cavity ona deer is much lower than most think. Just about every shot I see on the hunting shows are borderline too high andI would guess a good number of regular bowhunters shoot high. Hence all of the I hit just above where I was aiming and the arrow only penetrated a few inches and I never found him threads. I'm in hisSylvan's campin that a good hit will put a deer down in a hurry and should never be lost.