rhamphotheca การใช้

This covering is called the rhamphotheca.
It ranges widely across the North Pacific, feeding on small fish and nesting in rhamphotheca ).
Two bony projections the upper and lower mandibles are covered with a thin keratinized layer of epidermis known as the rhamphotheca.
Members of the family Picidae have strong rhamphotheca, made of scales formed from keratin proteins, an inner layer of bone which has a large cavity and mineralized collagen fibers, and a middle layer made of porous bone which connects the two other layers.
Unlike probing foragers, the tactile pits in parrots are embedded in the hard keratin ( or rhamphotheca ) of the bill, rather than the bone, and along the inner edges of the curved bill, rather than being on the outside of the bill.