ABSTRACT
With lateral eyes, the blind region behind the animal is minimal, but the overlap of the fields of view ahead of the animal is sacrificed. With frontal eyes, the overlap of the fields of view ahead is maximal, but the scope of the field of view is sacrificed and the blind region is large. Complete simultaneous ambience of perception is impossible. There has to be some gap in the combined field of view simply because the body of the animal itself is there, that is, its body is bound to hide some of the surfaces of the surrounding environment. Simultaneous ambience of perception is unnecessary in any case if the animal can always turn its head. There is no need to perceive everything at once if everything can be perceived in succession.
