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==Introduction==
 
==Introduction==
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Includes development and overview of the system
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The avian respiratory system contains some fundamental changes to the mammalian system.
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==Structure==
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==Avian Nasopharynx and Oropharynx==
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*The nostrils of the bird, which lead into the nasal cavity, may have a flap of horn to protect them, known as the ''Operculum''.
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*The Oral Cavity and the Nasal Cavity of the bird are interconnecting via a slit in the hard palate called the ''Choana''.
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*The
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[[Image:Avianheadsaggitalsection.jpg|right|thumb|350px|©Nottingham 2008 ''Saggital Section of an Avian skull showing the conchae.]]
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==Function==
 
==Function==
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