Their hearing

They can use their triangular shaped ears that rotate independently to hear sounds from 6 to 10 miles away depending on the terrain and wind, which demonstrates why their sense of hearing is considered their most acute sense after smell. They can hear sounds up to a frequency of 25khz, with a maximum of up to 80 khz according to some researchers. and their hearing and interpretive abilities evolve to allow them to respond appropriately to these same vocalizations coming from other wolves, reaching the time where, in combination with their sense of smell, sight, and touch, they can recognize their mother through her vocalizations as well as other key pack mates. Wolves' strongest sense is their sense of smell, which is roughly 100 times more powerful than that of humans and 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.

Image from Tambako The Jaguar