[Junior]

Good catch. There are some structural differences between hair and feathers, though, including the anchoring. IIRC from the "fighting dinosaurs" exhibit in 2000, feather attachments actually leave telltale marks on the skeleton.

Hair did develop from the same structure (scales) as feathers, but it developed in a branch of reptiles (not dinosaurs) that led to mammals and flying reptiles (yes, pteranadon had fur -- at least that's what a few Russian fossils indicate).

[Dog Gone]

feather attachments actually leave telltale marks on the skeleton.

How could that be? I've never seen a feather on a bird which was attached to the skeleton. Admittedly, my first-hand experience is limited to ducks, quail, doves, and turkeys, but it's hard to imagine that this would ever be the case.