In a message dated 11/25/01 12:37:42 PM, firstname.lastname@example.org writes: << BTW: how many times did the sickle claws appear in dinosaur evolution? Twice (once in maniraptorans, once in ceratosaurs: _Noasaurus_)? May we say it's convergent evolution? >> No. This is the proof that maniraptors are in fact flightless birds. eric l.