Assertion: porcupine's guard hair | /r/HasProperty | brown
Facets:
value: at the base
type: LOCATION
Source sentences:
text: At the base, each guard hair is brown, becoming darker near the tip, which may be white in eastern populations and yellow in the western ones.
text: The front half of the porcupine's body is covered in long guard hairs which are a yellowish colour in the west and black or brown in the east.