A Birds-eye View
After years of research, scientists are finally beginning to understand the meaning of birds-eye view. While humans have three color receptor cells, or cones, in our eyes to detect red, blue and green, birds are blessed with four. SciShow’s Hank Green tells us that birds not only can see the Earth’s magnetic field but also ultraviolet light, and throws in a few more amazing facts about our fine feathered friends.
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