"Finding quill knobs on Velociraptor means that it definitely had feathers," said study team member Alan Turner, a paleontology graduate student at the American Museum of Natural History and at ...

(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 ...

By contrast, the older dinosaur sported long quills, with each tail feather measuring 13.7 inches (35 centimeters) long and a typical arm feather measuring roughly 9.8 inches (25 centimeters) long.

Warren then used a falcon feather quill as a bridge between the shaft of the original feather and attached the osprey feathers with quick-drying epoxy. She also filled some gaps with red-tailed ...