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Re: Science feather strength debate

>> The ancestral form, which had rudimentary wings for brooding the nest,
> could have had indeed -- but this is not a "necessary" step...

Yes, of course it is not certain. But Conchavenator may have had enlarged 
feathers on the ulna, and this might suggest that ulnar feathers evolved no 
later than the last common ancestor between carcharodontosaurs and birds lived. 
Of course it could be even earlier. In any case, it is then quite possible that 
"wings" were serving some function separate from climbing into trees.