2. Myth: Dogs cannot see color, only black and white.

谬误2：狗不能辨别颜色，只有黑色和白色。

Dogs can see color, but not as wide a spectrum as humans can. In addition to black, white and shades of grey they can also distinguish between blue-voilet and yellow-green colors. In would probably be more correct to say that dogs are green-blind. Your pup may very well confuse red, orange and green, as well as green-blue, gray, and shades of purple. Researchers have shown that a dog’s eye has both rods and cones, although they only have two cones whereas a human eye has three. Only if dogs had no cones at all would they have been restricted to seeing black and white.

狗是可以看到颜色的，但其光谱不如人类的宽。除了黑色，白色和灰色阴影，他们还可以区分蓝紫和黄绿的颜色。可能这样说会更正确些，狗是绿色盲。你家的小狗很可能会混淆红色、橙色和绿色，以及绿-蓝色、灰色和紫色阴影。研究人员表明，狗的眼睛中既有视杆也有视锥，但它们的眼睛只有2个视锥，而人类眼睛有3个。只有当狗根本就没有视锥的情况下，它们才会只能看到黑色和白色。