Why not to shoot a deer in the head?

Answer 1

The idea is to make a clean quick kill, and not to have the animal suffer unnecessarily. A head shot is very difficult because the brain and spine are very small in relation to the rest of the body, in addition the head is well protected by bone which can deflect or slow down a bullet to the point where the shot only wounds the animal.

a chest shot provides a much larger "kill zone" where a bullet, arrow, slug, or shot, can go through many different vital organs i.e. the heart, lungs, liver, spleen and assorted arteries and veins, causing either instant death or a very quick bleed out and death from shock. leading to less suffering, more kills per attempts.

additionally bullet manufacturers have been designing and refining special bullets specifically to dump all of their energy into the chest cavity of a north American white tail deer.