What does (almost) every animal have? A butt and a mouth. They’re even the first things you grow as a little blastula. So if you’re going to put sensory organs (ears, eyes, nose, etc.) on that animal then it makes sense to put those near the mouth because you want to sense the things you’re eating.
and as others have explained, it makes sense to have what’s processing those senses be as close to them as possible.
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