Comment by bonsai_spool

Helpful reframing on this reddit post: https://www.reddit.com/r/answers/comments/mo5sqi/do_any_anim...

What do ears do? Transduce pressure vibrations into intelligible signals. If this is our understanding of an 'ear', we never really need more than two but instead need either binaural or non-binaural/decoupled. Beyond that, what does having more openings grant us that we're not getting with all the other pressure-sensitive organs we have? (namely all of our skin, some specialized tissues in other animals)