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Re: Lemurs and Feathers

>>Following this lead and Richard Prum's paper on the
origin of feathers, I'm concluding once again that indeed  hairy or
branched integument was first (that is, all ancestral dinosaurs must
have been 'hairy' at some stage) and single (or several broom-like)
thicker quills sporting barbules evolved in arboreal forms to hold the
strands together and perfect the 'parachuting' effect.<<

Makes sense to me, but why give hairy feathers to "all ancestral
dinosaurs"?  Why not just the ancestors of the dinosaurs that flew?  Or was
I misinterpreting the text?