The tiny birds’ ability to see colors outside the rainbow is “one of the most exciting things I’ve ever witnessed,” one scientist says
in Colorado. The remarkable results revealed the birds could discern spectral-colored feeders from feeders in nonspectral colors.
“We’re really only beginning to scratch the surface in our understanding of color vision in animals,” he says.outfitted with LED devices near the laboratory. They programmed LED devices near the feeders to turn a surface two different colors, depending upon whether the feeder held either a small amount of sugary water or plain water.
The hummingbirds, which eat flower nectar, quickly learned to associate one color with a rewarding sweet sip, and the other color with unrewarding plain water. “Even when the colors looked the same to us—for example, when the birds had to choose from a feeder colored UV-green and one that was simply green—they could see the difference,” says Stoddard.They move so fast that human eyes see only a hovering spot of color, a blur of wings. But when frozen in time by high-speed cameras, hummingbirds yield their secrets.
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