Just wonder when the medullary bone first shows up in female bird and dino in their life time. If this formed, will it disappear when it's not in reproduction phase?
David J Varricchio
In birds, females lay down medullary bone as the reproduction season approaches, it is then used during the egg-laying period. So, it is typically only present seasonally. I think the case for simply the presence of medullary bone in non-avian dinosaurs is still open for debate.
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