Unlike its more primitive predecessor Pakicetus, the structure of the ears suggests that Protocetus was able to hear properly underwater, although it is unlikely that it could echolocate.
Za razliku od svog primitivnijeg prethodnika, Pakicetusa, struktura uha ukazuje na to da je Protocetus mogao dobro čuti pod vodom, mada je malo vjerojatno da je bio sposoban koristiti eholokaciju.