Mark Whitacre:"When polar bears hunt: they crouch down by a hole in the ice and wait for a seal to pop up; They keep one paw over their nose so that they blend in, because they've got those black noses; They'd blend in perfectly, if not for the nose. So the question is: How do they know their noses are black? From looking at other polar bears? Do they see their reflections in the water and think: 'I'd be invisible if not for that'? That seems like a lot of thinking for a bear."
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