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No modern birds possess [[:Category:Teeth - Anatomy & Physiology|teeth]], however rudimentary [[Enamel Organ|enamel organs]] have been discovered in the embryos of some birds.
 
No modern birds possess [[:Category:Teeth - Anatomy & Physiology|teeth]], however rudimentary [[Enamel Organ|enamel organs]] have been discovered in the embryos of some birds.
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The size and structure of the avian [[The Avian Tongue - Anatomy & Physiology|tongue]] varies between species; it is related to the functional requirements of each species.
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The size and structure of the avian [[Avian Tongue - Anatomy & Physiology|tongue]] varies between species; it is related to the functional requirements of each species.
    
The [[Avian Hard Palate|avian hard palate]] contains a slit-like opening called the choanal opening which communicates with the [[Nasopharynx - Anatomy & Physiology|nasal pharynx]].  
 
The [[Avian Hard Palate|avian hard palate]] contains a slit-like opening called the choanal opening which communicates with the [[Nasopharynx - Anatomy & Physiology|nasal pharynx]].  
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