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I thought that there was some discrimination between the species of raptors as to which had feathers and which didn't. For some reason I'm thinking that the Utah Raptor was heavily feathered [and by 'heavily' I just mean for a fucking dinosaur] and others were 'naked', if you'll pardon the term.
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Many recent finds of well-preserved dromaeosaurids (raptors) from places like the Liaoning province in China are basically whole skeletons in rock slabs, and in many of them, including Microraptor, Mei Long, Sinosauropteryx and many small, carnivorous relatives like Caudipteryx, there is a ring of feather imprints surrounding the skeletons like a halo.
Now we only found the primary feather indents in the arm of Velociraptor after examining the bone carefully. If I had to guess, the only reason we haven't found similar structures, or these "feather halos" around the bones of species we'd known about for a long time, like Deinonychus or Utahraptor, is because we simply weren't using the same delicate techniques we use now. Another reason is that we just weren't looking for them. Feathers on dinosaurs is a fairly recent revelation in the field of paleontology, so perhaps with further examination and a more surgical excavation, we'd get a more definitive answer.
I need to mention that I don't think we've excavated enough of Utahraptor to even know if it was feathered or not; just a claw and perhaps a bone or two. I think you may have meant a different species, because I've never seen confirmation of that.
What I'm saying is this: paleontology is guess work. A lot of really educated guess work, and it's a safe bet to assume that since we've discovered so many dromaeosaurids with feathers, that most "raptor" dinosaurs were probably feathered, to a certain degree, factoring in variables like climate and evolutionary development and use of the feathers. Most animals on that branch of the evolutionary tree were also feathered (since not all feathers must be used for flight).
Since these primitive feathers were more like fur than contouring, complex feathers of modern birds, it's smart to imagine that, like mammals, the bigger the dinosaur got, the less feathers it may have had. Elephants have almost no fur, while felines have fur at different lengths, depending on their environment.
It's a really recent development in paleontology, so I expect we'll find out a lot more in the years to come.