Assertion: hedgehog's spine | /r/HasProperty | hollow
Facets:
value: usually
type: DEGREE
value: from the inside
type: OTHER
Source sentences:
text: They are covered with a coat of very sharp spines, which are hollow and made of keratin (like your fingernails).
text: Their spines are hollow hairs made stiff with keratin.
text: The spines are hollow and springy and controlled by msucles.
text: These spines are actually modified hair, which are hollow from the inside and are stiff.
text: Their spines are springy and hollow.
text: The spines are usually hollow and cylindrical.