Jan 08, 2015 — Porcupine quills are hollow, like feathers, and are made from the same material, but then so are hairs, and fingernails, and claws and scales.

“Finding quill knobs on velociraptor, though, means that it definitely had feathers. This is something we'd long suspected, but no one had been able to prove.” ...

Velociraptor Had Feathers Date: September 20, 2007 Source: American Museum of Natural History Summary: Finding of quill knobs on fossilized velociraptor bone demonstrates that even large dinosaurs ...

(A) View of right ulna of Velociraptor IGM 100/981. (B) Detail from cast of red box in (A), with arrows showing six evenly spaced feather quill knobs. (C) View of right ulna of a turkey vulture ...

Each arm has 10 primary feathers and 12 secondary ones, and the tail had at least 12 pairs. All of them are quill-like from base to tip and the arm feathers are just as long as the tail ones.