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Why animal pupils vary, from vertical slits to horizontal bars?
A domestic cat’s eye narrows to a razor-thin vertical slit in bright sunlight, while a grazing sheep stares out through a wide horizontal bar. These are not cosmetic quirks. A 2015 study in Science ...
From slits to rectangles and W-shapes, animal pupils reveal how life adapts. Discover these 10 animals with the most unusual pupil shape.
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