what is the range in db level of normal human hearing
Hearing range
The auditory system of a land mammal typically works via the transfer of sound waves through the ear canals . Ear canals in seals , sea lions , and walruses are similar to those of land mammals and may function the same way . In whales and dolphins , it is not entirely clear how sound is propagated to the ear , but some studies strongly suggest that sound is channeled to the ear by tissues in the area of the lower jaw . One group of whales , the Odontocetes ( toothed whales ) , use echolocation to determine the position of objects such as prey . The toothed whales are also unusual in that the ears are separated from the skull and placed well apart , which assists them with localizing sounds , an important element for echolocation . Dolphins
The auditory system of a land mammal typically works via the transfer of sound waves through the ear canals . Ear canals in seals , sea lions , and walruses are similar to those of land mammals and may function the same way . In whales and dolphins , it is not entirely clear how sound is propagated to the ear , but some studies strongly suggest that sound is channeled to the ear by tissues in the area of the lower jaw . One group of whales , the Odontocetes ( toothed whales ) , use echolocation to determine the position of objects such as prey . The toothed whales are also unusual in that the ears are separated from the skull and placed well apart , which assists them with localizing sounds , an important element for echolocation . Dolphins