Assertion: fox's fur coat | /r/CapableOf | trap a layer of air
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Source sentences:
text: Additional reasons they can thrive in a frozen habitat include a thick, layered fur coat (the warmest pelt of any animal living in the Arctic) that traps a layer of air and preserves body heat, and fluffy tails that cover their heads like a built-in blanket for added insulation when they curl up to sleep.