Like bats, which use sound waves to "see" in the dark, whales have a kind of natural "sonar" system that enables them to determine the position, distance, and nature of objects ahead.
鯨類智商很高，它的「靈魂之窗」就是一套聲納系統，由頭部前端發出音波，依音波反射回來的程度及強弱，判斷前方物體的方位、距離及性質，再據以在水中行進、獵食，猶如蝙蝠用超音波在黑暗中「看」東西。