Despite Eric's comments: yes, sickle claws evolved more than once in the history of theropods. _Noasaurus_ is most definitely not a maniraptoran (bird or otherwise), and has a sickle claw.<<
* Having just drawn Noaosaurus's remains I must say I don't think you can really say Noasaurus has a sickle claw. It's much much wider and not thin like the 'killer' claw of dromaeosaurids (Ah, its nice to use their real name :) ).
-DinosØMP
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