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pelvis/sacrum question

Wonder if anyone has the answer to this one:

Typically in pterosaurs, dinosaurs and other reptile types when the sacrum 
coosifies so then is the sacrum coosified to the entire ilium (or at least the 
sacrum sends out sacral ribs), but in mammals this doesn't seem to be the case. 
Only two(?) sacral ribs seem to be present high on the ilium and the rest just 
sort of hang there extending out to form a tail. 

In functional terms, why the difference?

David Peters
St. Louis