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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]].
 
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]].
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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.
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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.
    
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.
 
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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