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One possibility that constrains size is related to flight. Above a
certain mass, they may just not be able to generate enough power to lift
off. Living ratites, of course, have escaped this problem by increasing
total mass, reducing forearm size, and giving up flight. They can still
move rather rapidly in a bipedal mode.
There also may be metabolic limitations, eg ability to undergo sustained
anaerobic energy production, but that has not been demonstrated AFAIK.
Without question all the reasons posted on this thread may be in play.
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