Are Dogs color blind?

You know the old idea that dogs see only in shades of gray?

Studies have shown that’s not true. Dogs do see some colors, though their color vision doesn’t reveal a world as richly or intensely colored as the world we see. Now a new study by scientists, published this month in the peer-reviewed journal Proceedings of the National Academy of Sciences, shows that our human color vision can’t compete with that of wild hummingbirds. These fleet little birds perceive a world far more richly hued than ours, full of visual cues humans never notice, via colors we can’t imaguine. In fact, said evolutionary biologist Mary (Cassie) Stoddard at Princeton:

Humans are color-blind compared to birds and many other animals.

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