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==Introduction==
 
==Introduction==
 
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[[Image:Kestrel beak.jpg|thumb|right|150px|Beak of a kestrel - Copyright nabrown RVC]]
 
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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