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Re: Archaeopteryx chimaera

Does anybody know why certain theropods (dromaeosaurids, birds,
therizinosauroids) have the pubis pushed back?  I have heard that
ornithischians have an opisthopubic pelvis because it makes space for a
bigger gut (always helpful when digesting cellulose-rich, nutrition-poor
plant matter).  This could apply to therizinosauroids too, but why did
dromaeosaurids and birds do it?