Targeting these vitals on the deer provides for the greatest margin of errof.
Here is a anatomy diagram showing the internal organs and structure of a whitetail deer.
Having said that, the red dots on some of the trail cam pics are gonna result in a log tracking job. We tracked it to another cross road (large amount of blood) into a field where we can't locate the blood because of course it rained last night. Also remember that from a stand, you need to aim where you want the arrow to COME OUT on the opposite side.
At normal stand heights of 18 feet (avg)this will normally put your aiming spot a bit higher.
Is other hunters we always go out of our way to help another hunter. Thanks for the pics makes me feel more confendent in the woods now. thanks for the diagrams i didnot get a deer last year being my first yea hunting and not knowin where to place an arrow on a deer for the most painless death with out a lot of suffering good luck everyone im going out friday with my crossbow The anatomy diagrams is a great tool to look at from time to time. How far is it possible for a deer to run if it was one lunged? Your 'red dots' are generally ok, but I prefer about four inches to the right if the deer is facing the left. This give you a little wiggle room for error, the deer moving at release, or windage.Go slow and look carefully one drop here or there is hard to see but be persistant.LED lights work well at night as do the old gas Colemen lanterns both tend to make the blood florese.Personally I use a fixed blade broadhead ( thunderhead 100). Sometimes a blood trail can be lost especially if the deer is booking it like crazy through the woods because only droplets can be seen at times depending on your arrow placement. I have found over the years that once a deer is hit and it heads in a direction is will almost always stick to that general direction even if it doubles back it will turn and continue in the direction it started.Shot a 8pt 205lb deer this morning at 18 yards in the lungs and it only went 100 yards. Particularly in the lungs if there is no pass through think i may have had a lung or airway shot. It will normally stick to deer trails where it can move easily.