Assertion: ostrich's wing | /r/HasProperty | vestigial
Facets:
Source sentences:
text: The wings were vestigial, with the upper wing-bones small and highly reduced, similar in proportion to the wings of the cassowary.
text: The wings of the ostrich are a vestigial trait: a feature of a species that was an adaptation in its ancestors, but that has either lost its usefulness completely or, as in the ostrich, has been co-opted for new uses.