One of the more intriguing aspects of bird anatomy is their ears ... no bird species have been found to hear ultrasonic waves ...

But what an incredibly intricate and highly developed system. And that's just the little bit that we can see, so remember to appreciate your ear, because there's no hearing without the ear.

A new study shows that women have more sensitive hearing than men and that where people live — urban vs. rural or high vs.

Figure 1A. The ear has 3 parts. Conductive hearing loss usually due to problems in external ear; sensorineural hearing loss usually results from middle- or inner-ear disorders. Figure 1B.