Assertion: bison's fur | /r/HasProperty | black
Facets:
Source sentences:
text: Just like people have different hair colors, African buffalos can have different-colored fur, which may be black, dark brown, muddy brown, or red.
text: Fur on the upper body, though usually gray, may be brown, reddish, black, or whitish, while the underparts and legs are usually yellow-white.