Their four-color cone vision is referred to as tetrachromatic. In a new study, researchers set up a field experiment to test how wild broad-tailed hummingbirds reacted to these colors.

But birds have four color cones, meaning they are tetrachromatic. With our three color cones, we can see the colors of the rainbow—red, orange, yellow, green, blue, indigo, and violet—the so ...

“It is proven that some women have four cone types that could serve tetrachromatic color vision,” said Dr. Jay Neitz, a color vision researcher and ophthalmology professor at the University of ...

Our results support the idea that birds can distinguish colors throughout tetrachromatic color space and indicate that nonspectral color perception is vital for signaling and foraging. Since ...

One percent of the world’s population is thought to be tetrachromatic, but it’s not easy to demonstrate empirically. “The difference between [the color dimensions perceived by] a ...

Most people have three types of cones and can tell apart several million types of colors. Their project, "Theory of Human Tetrachromatic Color Experience and Printing," will explore how more of ...