I was wondering if it's an evolutionary advantage to have many sensory organs in a small place of the body, the head. This applies to mammals, reptiles, synapsid, dinosaurs... and many more.

**My theories:**

 - The distance to the brain is short and thus smaller time delay to
   respond faster to the outside world,have more reflexes, hunt faster
   prey and fight more accurately.
 - The short distance makes the "wire" (signal carrying) shorter and
   thus less vulnerable to be cut from a injury, because for a organism
   losing an eye reduces possibilities of survival dramatically.
 - In humans at least the head is the upper part, then vision organs
   *see more* with less obstacles such as vegetation or terrain irregularities, or anything that obstacles vision, normally higher
   means seeing more things. This I'm not sure applies so strongly to
   smell. To taste, certainly not. To hearing, possibly a little,
   thought nor much as vision.

We evolved from a common ancestor that was like that but that doesn't explain why it's not common to get out of that coincidence.