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In avian species, the [[Lips - Anatomy & Physiology|lips]] and [[Cheeks - Anatomy & Physiology|cheeks]] are replaced by the [[Skin - Anatomy & Physiology#Cutaneous Appendages|beak]].  
 
In avian species, the [[Lips - Anatomy & Physiology|lips]] and [[Cheeks - Anatomy & Physiology|cheeks]] are replaced by the [[Skin - Anatomy & Physiology#Cutaneous Appendages|beak]].  
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The [[Skin - Anatomy & Physiology#Cutaneous Appendages|beak]] is an area of dense, horny skin overlying the incisive bones of the mandible.
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The [[Skin - Anatomy & Physiology#Cutaneous Appendages|beak]] is an area of dense, horny skin overlying the [[Skull and Facial Muscles - Anatomy & Physiology#Incisive Bone (os ncisivium)|incisive bones of the [[Skull and Facial Muscles - Anatomy & Physiology#Mandible (mandibula)|mandible]].
    
No modern birds possess [[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology|teeth]], however rudimentary [[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology#Anatomy of the Enamel Organ|enamel organs]] have been discovered in the embryos of some birds.
 
No modern birds possess [[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology|teeth]], however rudimentary [[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology#Anatomy of the Enamel Organ|enamel organs]] have been discovered in the embryos of some birds.
    
[[Image:Avian Tongue and Oral Cavity.jpg|thumb|right|150px|Avian Tongue - Copyright RVC 2008]]
 
[[Image:Avian Tongue and Oral Cavity.jpg|thumb|right|150px|Avian Tongue - Copyright RVC 2008]]
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==Links==
 
==Links==
  
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