Assertion: dinosaur's feather | /r/HasProperty | anchored to the bone
Facets:
Source sentences:
text: While the Velociraptor was featherless in the movies, paleontologists discovered quill knobs (places where the flight-related feathers of birds are anchored to the bone) on a well-preserved Velociraptor forearm from Mongolia in 2007, indicating the dinosaur had feathers.