An ex-captain of the Salem militia is infuriated by the increase of crime on the streets â HIS streets! Although the Vigilante was fired for his violent and rash methods of war, he still has a strong sense of justice, or so he tells himself. As the death toll in the Town rises, his anger only grows as he finds the killer's identity obvious.
Dogs hear at a wider range of frequencies than humans.The low end of the range is similar: 67 Hz, but dogs hear noises up to 45 kHz, while humans only hear sounds up to about 23 kHz. This means that they could be hearing and responding to sounds that we can't hear at all.
10G: Animal Hearing. (NOTE: Much of the information about animal perception in this chapter and in Chapters 14 and 16 come from the excellent book Engineering Animals: How Life Works by Mark Denny and Alan McFadzean.) Many animals, including dogs, can hear frequencies in the ultrasonic range (above 20,000 Hz). Dog whistles used to train dogs have frequencies between about 23,000 Hz and 54,000 Hz so dogs (and many other animals) can hear them but humans cannot.