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The avian respiratory system contains some fundamental differences to the mammalian system.
 
The avian respiratory system contains some fundamental differences to the mammalian system.
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==Avian Nasopharynx and Oropharynx==
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==Avian Nasal Cavity and Oropharynx==
    
The nostrils of the bird, which lead into the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]], may have a flap of horn to protect them, known as the ''Operculum''. The Oral Cavity and the Nasal Cavity of the bird are interconnecting via a slit in the [[Hard Palate|hard palate]] called the ''choana''. Birds lack a [[Soft Palate|soft palate]].
 
The nostrils of the bird, which lead into the [[Nasal Cavity - Anatomy & Physiology|nasal cavity]], may have a flap of horn to protect them, known as the ''Operculum''. The Oral Cavity and the Nasal Cavity of the bird are interconnecting via a slit in the [[Hard Palate|hard palate]] called the ''choana''. Birds lack a [[Soft Palate|soft palate]].
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