This was interesting:
https://www.backyardchickens.com/t/435248/vaulted-skulls
It appears vaulted skulls are apparent at birth or shortly after.
THIS was even more informative as they are photos of actual chicken skulls. Not for the squeamish. http://www.personal.psu.edu/staff/l/a/lah161/skull photos.html
A little more info- with bone only skull pictures. http://www.browneggblueegg.com/Article/HoleInHead.html
https://www.backyardchickens.com/t/435248/vaulted-skulls
It appears vaulted skulls are apparent at birth or shortly after.
THIS was even more informative as they are photos of actual chicken skulls. Not for the squeamish. http://www.personal.psu.edu/staff/l/a/lah161/skull photos.html
A little more info- with bone only skull pictures. http://www.browneggblueegg.com/Article/HoleInHead.html
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