Assertion: manta ray's fin | /r/HasProperty | wing
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: The giant manta ray has a diamond-shaped body, with a wide central “disc” and triangular pectoral fins that when moving in the sea seem to be wings beating.
text: The fins of these fish are sometimes called wings, as they both look and move much like a bird’s wings.