Assertion: gull's wing | /r/HasAspect | larger white mirrors
Facets:
Source sentences:
text: The California has relatively longer and narrower wings, which from above have a larger and blunter-based black wing-tip area and larger white mirrors; in flight from below, slightly darker tone of the California’s upperparts apparent as a dusky-gray subterminal secondary band that offsets white trailing edge (underwings more evenly white on the ring-billed).