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The diet of Sinornis (was Lemurs and Feathers

>><Perhaps, but *Unenlagia*, *Achillobator* and, more importantly,
*Archaeopteryx* don't have it. BTW, the pubes of basal
ornithothoracines like *Sinornis* are retroverted, but not as
far as in ornithischians and segnosaurs.>

  Well, in the later it seems to be irrelevant, and that it may
be corrolary to diet.<<

Would you care to expand upon that?  Not much attention has been focused
on the probable behavior of fossil birds (other than Archaeopteryx and a
little on Confucisornis).  What was Sinornis's probable lifestyle?