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<big><center>[[Avian Digestive Tract - Anatomy & Physiology|'''BACK TO THE AVIAN DIGESTIVE TRACT''']]</center></big>
 
<big><center>[[Avian Digestive Tract - Anatomy & Physiology|'''BACK TO THE AVIAN DIGESTIVE TRACT''']]</center></big>
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==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|beak]]. The beak is an area of dense, horny skin overlying the incisive bones of the mandible.
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No modern birds possess teeth, however rudimentary enamel organs have been discovered in the embryos of some birds.
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==Links==
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[[Lips - Anatomy & Physiology]]
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[[Cheeks - Anatomy & Physiology]]
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[[Oral Cavity - Teeth & Gingiva - Anatomy & Physiology|Teeth - Anatomy & Physiology]]
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