Assertion: bighorn sheep's horn | /r/HasProperty | permanent
Facets:
value: on the head of various animals
type: LOCATION
Source sentences:
text: Horns are permanent and consist of a sheath of keratin (a hard protein found in fingernails and hair) covering a boney core.
text: A horn is a permanent pointed projection on the head of various animals that consists of a covering of keratin and other proteins surrounding a core of live bone.
text: The horns are permanent and consist of a sheath of keratin (a hard protein found in fingernails and hair) covering a boney core.