In that respect the presence of medullary bone in the specimens from Lee Creek Mine in North Carolina, United States, is notable, as among birds this is generally only found in laying females, indicating that the breeding grounds were probably not far away.
A este respecto a presenza de óso medular nos espécimes de Lee Creek Mine en Carolina do Norte (EUA) é notable, e entre as aves esta característica xeralmente se encontra nas femias grávidas, o que indica que os terreos de aniñación non se encontraban moi lonxe.