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Construction principles of the beak skeleton in the hatchling

, : Construction principles of the beak skeleton in the hatchling. Journal fuer Ornithologie 134(3): 301-307

The structure of the beak skeleton of hatchlings was analysed using a new direct magnifying X-ray technique. The application of these microfocus X-ray systems reveals a quite uniform construction of the beak skeleton in the hatchlings, independent from the mode of development of the bird species groups studied (precocial, altricial etc.). The amount of ossification as well as the specific osteoarchitecture of the jaw bones of the beak apparatus - especially in the region of Substantia spongiosa of the Os praemaxillare - may be considered as an anatomical adaptation to mechanical stress of the jaw bones during picking of the eggshell.


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