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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''.
 
*The nostrils of the bird, which lead into the 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 called the ''Choana''.
 
*The Oral Cavity and the Nasal Cavity of the bird are interconnecting via a slit in the hard palate called the ''Choana''.
*The
   
[[Image:Avianheadsaggitalsection.jpg|right|thumb|350px|©Nottingham 2008 ''Saggital Section of an Avian skull showing the conchae.]]
 
[[Image:Avianheadsaggitalsection.jpg|right|thumb|350px|©Nottingham 2008 ''Saggital Section of an Avian skull showing the conchae.]]
 
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*There are Rostral, Middle and Caudal Conchae arising from the lateral wall, filling part of the nasal cavity.
    
==Function==
 
==Function==
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