Wolves have incredibly good hearing and can hear sounds up to six miles away, including some high-pitched sounds that even a human can’t hear, in the range where bats and porpoises produce sound. Even when it sleeps, a wolf’s ears stand straight up so it can catch sounds made by other animals at all times.
This helps the wolf catch prey, and lets it know when danger is near. Their large, pointed ears act like big scoops to catch lots of sound. Unlike humans, wolves can easily tell what direction sound is coming from by turning their ears from side to side. The direction the ears are pointing when the sound is loudest tells the wolf which direction the sound is coming from, which can help them locate rodents under a snow pack.
Next to smell, the sense of hearing is the most acute of the wolf sense. Wolves can hear as far as six miles away in the forest and ten miles in the open. Wolves can hear well up to a frequency of 25 kHz. Some researchers believe that the actual maximum frequency detected by wolves is actually much higher, perhaps up to 80 kHz (the upper auditory limits for humans is 20 kHz), also according to some naturalist wolves’ hearing is greater than that of the dog.