If optimists see the world through rose-colored lenses, some birds see it through ultraviolet ones. Avians have evolved ultraviolet vision quite a few times in history, a new study finds. Subscribe to ...

Birds, including chickens, are commonly used in animal research. However, housing facilities are often optimized for mammals and contain no ultraviolet (UV) light. Unlike mammals, most birds are ...

Human color vision depends on three types of cones—special cells sensitive to red, blue, or green light. However, many birds, reptiles, and fish have an additional kind of cone that can pick up ...

Humans can only see less than 1% of the electromagnetic spectrum. Here’s why evolution may have intentionally hidden ultraviolet light from us. Our vision is seemingly perfect as is. We can look at a ...

On a warm night in Florida, Todd Green walked up to a six-foot-tall cassowary named Ginger with a flashlight and a strange expectation. The light was ultraviolet, invisible to human eyes. Green, an ...

Indoor life is comfortable for pet birds, but it comes with one big downside: most homes don’t provide the kind of light birds evolved to live under. In the wild, birds spend hours in sunlight that ...

They can often see into the ultraviolet range, which should help them spot objects better than humans. But in larger bird species, UV sensitivity is reduced by the lens and cornea, which may explain ...