Assertion: american bison's horn | /r/HasProperty | black
Facets:
Source sentences:
text: The horns are black, curving upward and inward and ending in a sharp tip.
text: The horns of the bison are black, and they curve upward and inward, ending in a sharp tip.
text: The horns of the bison are black, and they curve upward and inward, ending in a sharp tip.