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==Introduction==
 
==Introduction==
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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]]. 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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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.
    
No modern birds possess teeth, however rudimentary enamel organs have been discovered in the embryos of some birds.
 
No modern birds possess teeth, however rudimentary enamel organs have been discovered in the embryos of some birds.
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