Editing Cochlea (section)

==Other animals==
The coiled form of cochlea is unique to [[mammal]]s. In birds and in other non-mammalian [[vertebrate]]s, the compartment containing the sensory cells for hearing is occasionally also called "cochlea," despite not being coiled up. Instead, it forms a blind-ended tube, also called the cochlear duct. This difference apparently [[Evolution of the cochlea#Evolutionary perspective|evolved]] in parallel with the differences in '''frequency range of hearing''' between mammals and non-mammalian vertebrates. The superior '''frequency range''' in mammals is partly due to their unique mechanism of pre-amplification of sound by active cell-body vibrations of outer [[hair cells]]. Frequency resolution is, however, not better in mammals than in most lizards and birds, but the upper frequency limit is – sometimes much – higher. Most bird species do not hear above 4&ndash;5&nbsp;kHz, the currently known maximum being ~ 11&nbsp;kHz in the barn owl. Some marine mammals hear up to 200&nbsp;kHz. A long coiled compartment, rather than a short and straight one, provides more space for additional octaves of hearing range, and has made possible some of the highly derived behaviors involving mammalian hearing.<ref>{{Cite book |last1=Vater |first1=Marianne |url=http://link.springer.com/10.1007/978-1-4419-8957-4_9 |title=Hearing Organ Evolution and Specialization: Early and Later Mammals |last2=Meng |first2=Jin |last3=Fox |first3=Richard C. |date=2004 |publisher=Springer New York |isbn=978-0-387-21093-3 |editor-last=Manley |editor-first=Geoffrey A. |volume=22 |location=New York, NY |pages=256–288 |doi=10.1007/978-1-4419-8957-4_9 |editor-last2=Fay |editor-first2=Richard R. |editor-last3=Popper |editor-first3=Arthur N.}}</ref>

As the study of the cochlea should fundamentally be focused at the level of hair cells, it is important to note the anatomical and physiological differences between the hair cells of various species.  In birds, for instance, instead of outer and inner hair cells, there are tall and short hair cells.  There are several similarities of note in regard to this comparative data.  For one, the tall hair cell is very similar in function to that of the inner hair cell, and the short hair cell, lacking afferent auditory-nerve fiber innervation, resembles the outer hair cell.  One unavoidable difference, however, is that while all hair cells are attached to a [[tectorial membrane]] in birds, only the outer hair cells are attached to the tectorial membrane in mammals.