Animal world
Hummingbirds can see the color 'invisible'
With four cone-shaped cells, the broad-tailed hummingbird can detect colors outside the visible spectrum of humans, the new study says.
Tetrachromacy
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5 Extremely rare superpowers you may be possessing without knowing
Our bodies are really amazing. When there is anything unusual, from pain to illness, it will have a way to tell us.