It's unclear why so many species sport iridescence colors, but a new study suggests that these shimmering shades may help animals confuse and escape from predators. To test this idea, a researcher trained quails to peck at virtual bugs on a touchscreen. The quails quickly learned how to nab the black bugs, but they had more trouble with the iridescent virtual bugs, the study found. [Read the full story on iridescent critters]

Shimmering dragonfly

 

Dragonflies are one type of insect with iridescent colors. It's possible that these shimmering hues make it harder for predators, such as birds, to catch prey. The researchers did the experiment in a controlled lab environment, but it's possible that the results translate to the wild, giving dragonflies an advantage over insects that don't have iridescent colors whenever predators are nearby. (Photo credit: Pixabay | Creative Commons)


Colorful kingfisher

 

The kingfisher, with its large head and pointed bill, is one of many birds that sport iridescent feathers. (Photo credit: Pixabay | Creative Commons)


Nicobar piegon

 

The iridescent Nicobar pigeon (Caloenas nicobarica) is native to the Nicobar Islands near the juncture of the Bay of Bengal and the Andaman Sea. Its also the closest living relative of the extinct dodo, according to a 2014 study in the journal BMC Evolutionary Biology. (Photo credit: Pixabay | Creative Commons)


Peacock feathers

 

The peacock, famous for its extraordinary tail, is also a member of the iridescent club. It's unclear why some animals have iridescence, but scientists have suggested a number of ideas. For instance, iridescence may differentiate between different sexes and species. It may also enhance water repellence, reduce friction and help with thermoregulation. (Photo credit: Pixabay | Creative Commons)


Rainbow boa

 

The rainbow boa (Epicrates cenchria) lives up to its name: Its scales glint a variety of colors when light shines across it at different angles. (Photo credit: Pixabay | Creative Commons)


Stag beetle

 

Many stag beetles shimmer in an assortment of colors. It's possible that some of these beetles have evolved to have iridescent coloring, especially if it helps them escape predators, as the new study suggests. (Photo credit: Pixabay | Creative Commons)

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