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→Species Differences
==Species Differences==
==Species Differences==
*'''The Cochlea''': the spiral has 3 turns in carnivores, 2.5 turns in horses, 4 turns in the pig, and 3.5 turns in ruminants.
*'''The Cochlea''': the spiral has 3 turns in carnivores, 2.5 turns in horses, 4 turns in the pig, and 3.5 turns in ruminants.
*The shape of the pinna varies between breeds and species.
*The shape of the pinna varies between breeds and species.
*'''Fish''': to detect high frequency sound, some fish use the swim bladder as an acoustic detecror. It is connected to the '''lagena''' (the stumpy piscine cochlea) by three ''Weberian'' bones. These are derived from vertebrae.
*'''Fish''': to detect high frequency sound, some fish use the swim bladder as an acoustic detecror. It is connected to the '''lagena''' (the stumpy piscine cochlea) by three ''Weberian'' bones. These are derived from vertebrae.
[[image: Rabbit ears.jpg|thumb|250px|left|Two rabbits: one with wild-type erect pinnae, the other with pendulous pinnae for comparison]]
The functional shape of the pinna in wild-type mammals is erect, and the muscular connections at the base of the pinna allowing positional adjustments to efficiently collect sound. Many domesticated species, however, have non-erect, pendulous pinnae, as a result of selective breeding. This and other conformational changes may contribute to aural disease, particularly in the dog, but also other species including the lop-eared rabbit.
==Equine Guttural Pouch==
==Equine Guttural Pouch==