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Is there something which limits large size in neornithean birds?

Dear all:
I was thinking why no neornithean attained a size in excess of 500 kg
(half a metric ton), whereas other coelurosaurs did. If pneumaticity
helps achieving large sizes, neornitheans may have advantage even over
most other dinosaurs.
Have some cause been proposed to explain this? Perhaps the horizontal
femur cannot avoid breaking up at large sizes? Perhaps the fast, and
especially determinate growth is a disadvantage (for attaining large
size) compared with animals with indeterminate growth? Why didn't
large Cenozoic birds grow enough to fill the space left by sauropods?
Augusto Haro.