Assertion: macaw's feather | /r/CapableOf | offer more insulation
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Source sentences:
text: Feather categories include wing feathers, tail feathers, contour feathers that cover a bird’s body and define its shape, filoplume (sensory) feathers, semiplume feathers that lie underneath contour feathers to provide some insulation, down feathers that offer even more insulation, and bristle feathers on the head that protect a bird’s eyes and face.