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.

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 ...

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.