Assertion: contour feather | /r/CapableOf | call vertsoverlapping feathers
Facets:
Source sentences:
text: Contour feathers on the wing, called covertscovertsCOH-vertsoverlapping feathers that shape the wing into an efficient airfoil, shape it into an efficient airfoilairfoilwinglike structure that produces lift and drag as it moves through the air by smoothing over the region where the flight feathers attach to the bone.