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        If you want to make dromaeosaurs secondarily flightless, you have
at least enough grounds to include troodontidae and oviraptoridae as well
as they have a lot of similar specializations. Other theropods lack these
specializations but are put inside a
troodontidae-dromaeosauridae-oviraptoridae clade by many authors (e.g.
tyrannosauridae and ornithomimidae) so if they fit in there their
ancestors probably would have had these features as well. Ornithomimids
and Tyrannosaurs aren't very birdlike in the arms and tails compared to a
Sinornithoides or something, but Alvarezsaurs show a weird mixture of
birdy and unbirdy characters, too, so they probably lost a lot of them.