Assertion: manta ray's mouth | /r/HasProperty | white
Facets:
Source sentences:
text: In addition, the mouth of the first is white and not black as that of the giant manta ray, whose lower edges of the wings are colored in black or a darker shade, which can be seen when watching it swimming from below.
text: The mouth is colored in a dark color, unlike the reef manta ray that has a white mouth.