Resumen de External ears. (Cover story)
The article discusses the evolution of pinnae, which are external ears, and their use in guiding sound to the middle ear which consists of sensitive auditory organs such as the tympanic membrane, also called the eardrum. Topics include a brief overview of why the embryonic development of ears coincides with jaw development, the differences in frequencies heard by humans and nonhumans, such as reptiles and amphibians, and the function of the pinnae.
