Assertion: petrel's feather | /r/CapableOf | run across upper wings
Facets:
Source sentences:
text: The upper surface is evenly grey contrasting with darker brown-black feathers running across the upper wings and rump in an M shape.
text: The upper surface is even dark-grey with darker brown-black feathers running across the upper wings and rump in an M-shape
text: The upper surface is grey contrasting with darker brown-black feathers running across the upper wings and rump.