Latest research: Nature says butterfly wing patterns can create optical illusions to ward off attacks

China News Service, Beijing, October 1 (Reporter Sun Zifa) A recent ecological study published in the international academic journal "Nature" pointed out that high-contrast patterns on butterfly wings can create optical illusions during flight, making it more difficult for predators to judge the butterfly's flight speed and direction. The findings suggest that wing patterns and flapping movements work together to form a mechanism to defend against attack.

According to the paper, high-contrast stripes and other patterns have long been thought to cause "motion vertigo," a visual effect that can interfere with a predator's observation of moving prey. However, studies of this effect in some animals (such as zebras, snakes, and lizards) have never produced conclusive evidence supporting this theory. Common targets in previous studies did not have moving wings or limbs, ignoring how these movements might affect predator perception.

In this study, the corresponding author of the paper, Jolyon Troscianko of the University of Exeter, UK, together with colleagues and collaborators, combined high-speed photography, computer modeling, simulated evolution and virtual experiments of catching butterflies to provide evidence that the pattern and movement of butterfly wings can cause strong optical illusions. By comparing high-speed images of real butterflies with computer simulations of unpatterned butterflies, they found that natural patterns on the wings are more likely to produce misleading motion signals than digital, unpatterned wings.

Subsequently, the authors of the paper further conducted a simulation study on 757 wing styles of 397 European species (including swallowtail butterflies, butterfly butterflies, and copper-colored butterflies) and showed that features such as contrasting vertical stripes, single strips, and hind wings are related to more confusing movements.

In the 3,000 butterfly catching experiments, participants were required to watch videos of different butterflies and then "catch" butterflies by touching the screen. If the butterflies had patterns on their wings that were expected to be more confusing, participants' attacks were directed farther behind them.

Experimental results suggest that the patterns of many butterflies may have evolved, in part, to mislead them about attacks during flight.

The authors note that other animals with contrasting patterns may have similar effects when they move, including the flapping wings of birds and the swishing tails of lizards and fish. They believe that further research on the underside of butterfly wings, as well as more flight movements, viewing angles, distances and backgrounds are needed.