Assertion: rattlesnake's scale | /r/HasProperty | raised ridge
Facets:
value: in the center of each scale
type: LOCATION
Source sentences:
text: Other distinguishing characteristics include vertical eye pupils; large heat-sensing pits between the eyes and nostrils (known as pit organs); a flattened, unmarked, triangular head about twice the size of the neck; and keeled scales (raised ridge in the center of each scale, making the skin appear rough).