Assertion: hedgehog's quill | /r/HasProperty | hollow
Facets:
value: with complex air chambers
type: OTHER
value: like the shaft of a feather
type: OTHER
value: inside
type: LOCATION
Source sentences:
text: Their quills are actually "spines" which do not have barbs, are not poisonous and are hollow inside.
text: Their quills are actually hollow hairs, stiffened with keratin, the same chemical that makes up human nails, hair, and outer skin layers.
text: Each quill is hollow –
text: The quill is hollow, like the shaft of a feather, and in the case of some African species, can be as wide as drinking straws.
text: The quills are hollow with complex air chambers that make them light but strong.