Most mammals, including mice, are dichromats, possessing only s and m cone pigments.
包括小鼠在内的大多数哺乳动物都是二色视，它们只有S和M视锥细胞色素。
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But bulls are color blind. Being dichromats, it isn't the color of the cape that bothers them, but the movement of the fabric. This incites the bull to charge.