Hal whitehead , a biology professor at dalhousie university in canada , said that sperm whales have sonars to find fish that are so powerful that they could permanently deafen others nearby if used at full blast .

加拿大达尔豪斯大学生物学教授哈尔怀德海指出，抹香鲸具有找出鱼群的声纳，该声纳威力强大，若全力使用恐使附近其他生物永久失聪。