>As to the matter of hollow bones, one may wonder which came first, the
>light hollow bones that facilitate flight and rapid respiration, or the
>that brought selection pressure for such bones. There may have been niches
>in which lightness and high metabolism was advantageous for a terrestrial
>organism. For example, in trees or in dry open country, neither of which are
>likely spots for fossilization.
Hollow bones break easily, they are a decided disadvantage to a land-living
creature. If there were an advantage, why no hollow boned mammals today?
Foundation, Fall and Flood
Adam, Apes and Anthropology
Lots of information on creation/evolution