After decades of exhaustive study, scientists have concluded that human tetrachromacy is real. Some people have a truly superhuman range of color vision. In fact, there are two distinct types of ...
Structures and functions of bird’s eye. (a) Bird vision. (b) Deep central fovea and four types of cones. (c) Foveated vision and tetrachromatic vision. The eyes of raptors such as eagles can ...
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