A histological survey of avian post-natal skeletal ontogeny.

PeerJ · 2021 · PMC8489414 · PMID 34703663

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Absolute cortical thickness appears to undergo an overall trend of increase in early ontogeny to a maximum thickness around the pin-feathered stage, a subsequent decrease from the fledgling to sub-adult stages, and final moderate increase to adult cortical thickness ( Fig. 2A ).

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