External auditory exostoses (EAE) are dense bony growths protruding into the external auditory canal. These benign bony growths are often referred to as surfer’s ear due to observations of these growths in the ears of individuals exposed to a combination of cold water and air.
Birds, with the exception of the Barn Owl, do not hear well at high frequencies. Chicken (hen or rooster), for example, have very sensitive hearing in the low frequencies but are limited to hearing sounds below 10 kHz. Given their sensitivity to low-frequency sound, one might wonder how a rooster that wakes up entire villages every morning with its crowing, keeps from losing its own hearing.
