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Re: Ah ha! That's where therizinosaurs came from

 Question 3, What about furculae?

When crown-group birds (other than penguins and plotopterids!) become flightless, their forelimbs become useless (except sometimes for activities like display that require very little muscle power), so the bones that anchor their muscles atrophy. But flight clearly wasn't the only function of the wings of *Confuciusornis* or *Archaeopteryx*; as GSP has mentioned very often (for example in Dinosaurs of the Air), flightless descendants of such animals should not be expected to lose all of their powerful forelimb musculature.

This is, frankly, good enough for me.