Assertion: black rhinoceros's horn | /r/CapableOf | curve toward the head
Facets:
value: backward
type: MANNER
Source sentences:
text: Rhino horns tend to curve backward, toward the head, because the keratin in front grows faster than the keratin in the back, Hieronymus told Live Science.
text: Rhino horns are made of keratin, and tend to curve backward, toward the head, because the keratin in front grows faster than the keratin in the back.