Avian Oral Cavity - Anatomy & Physiology
Introduction
In avian species, the lips and cheeks are replaced by the beak.
The beak is an area of dense, horny skin overlying the [[Skull and Facial Muscles - Anatomy & Physiology#Incisive Bone (os ncisivium)|incisive bones of the mandible.
No modern birds possess teeth, however rudimentary enamel organs have been discovered in the embryos of some birds.