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Flying slowly and silently through the night sky, barn owls are majestic nocturnal hunters that successfully prey on rodents scurrying along the ground below.

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Unlike the snowy owl, the barn owl lives at latitudes where it doesn’t regularly snow. The barn owl’s paradoxically bright plumage baffledbiologistJuanjo Negroand his colleagues, who thought the intriguing biological phenomenon warranted further investigation.

“We started from the intuitive feeling that the outstanding whiteness of the barn owl is so shocking that it should imply some adaptive advantage,” said Negro, a research professor at Doñana Biological Station–Spanish National Research Council in Seville, Spain, via email.

Previous research from September 2019had suggested that bright white coloration was essentially a form of shock and awe, exploiting rodents’ aversion to bright light. Making the predator more visible to the rodent prey, which freeze in fear, the owls’ whiteness made voles easier to kill, the prior study found.

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“When the moon is visible, the sky has some brightness that varies depending on the observing direction. Under these conditions, a dark bird would be seen by its potential prey as a black silhouette against the sky,” said Negro, the study’s lead author. “But, if the ventral part of the bird is reflective enough, in other words if it is ‘white’ enough, it would reflect a good part of the moon.”

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Barn owl expertAlexandre Roulin, a professor of biology at the University of Lausanne’s department of ecology and evolution who conducted the prior research that suggested the species’ white coloration shocked and immobilized its prey, said he was not fully convinced by the new explanation. However, he said he couldn’t rule it out.

“We do not wish to dismiss the authors’ hypothesis outright. It may, in fact, be complementary to our own. Perhaps at long distances the white plumage aids in camouflage, while at closer range, it may serve to make the owl more visible,” he said via email.

“We observed that voles remained immobile longer when the approaching owl was white rather than reddish. Previous research has shown that this immobilization is an anti-predator response,” Roulin said. “Based on this, we would argue that the voles recognized the white owl as a predator, suggesting that the owl was visible, rather than camouflaged.”

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Camouflage is often considered a daytime phenomenon based on light and shade. Negro said that there are likely other forms of animal coloration that served as nighttime camouflage, which has not been as well studied as daytime concealment tactics.

“Nocturnal ecology is an emerging field, and considering that half the animals in the planet are essentially nocturnal, adaptations to the natural cycles of the Moon are surely widespread,” he said.

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