过去人们认为狗只能看到黑白,实际它们能分辨蓝色和黄色,只是无法感知红色和绿色(类似人类的红绿色盲)。这是因为狗的视网膜中,感知红、绿的视锥细胞较少,而感知蓝、黄的视锥细胞更发达。难怪狗对黄色玩具更感兴趣,原来在它眼里,红色玩具和绿色草地“长得差不多”,根本分不清!
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