PARIS, France – Traditional white-striped body painting practiced by indigenous communities mimics zebra stripes to reduce the number of potentially harmful horsefly bites a person receives by up to 10-fold, according to new research published Wednesday, January 16.
Tribes in Africa, Australia and southeast Asia have practiced body painting in cultural ceremonies for generations.
Traditionally mixed from clay, chalk, ash and cattle dung, the white or gray paint is widely thought to help individuals moderate body heat in soaring bush and savanna temperatures.
But scientists now believe that the striking striped patterns also slash the amount of biting insects attracted to the naked flesh of people living in Nature.
It is known that zebras get bitten far less than animals with a single fur color, so a team of researchers decided to see if the light stripes painted on humans would have a similar deterrent effect.
They used 3 shop mannequins – one with dark skin, one with lighter skin, and a dark-skinned model painted with white stripes – and coated each with a thin layer of adhesive to capture creepy crawlies.
They then stuck them in the middle of a meadow for 8 weeks in summer, and counted the number of horseflies and other biting insects each one attracted.
The results were startling: the dark-skinned mannequin was 10 times more attractive to horseflies than the striped model and twice as attractive than the light-skinned dummy.
The team behind the study believe that the stripes disrupt the polarization of light reflected off human bodies, making them less delicious-looking to horseflies and other bugs.
"Traditional body paintings with their typical white-striped patterns on a brown body surface have the advantage of deterring bloodsucking horseflies as these patterns are unattractive to these parasitic insects," the authors wrote in the journal Royal Society Open Science.
Bites from horseflies and other pests can be dangerous as well as irritating, as they suck a host's blood, transmitting diseases such as the potentially deadly swamp fever.
Because of their need to lay their larvae in ponds and lakes, they often come into contact with indigenous people seeking reliable water sources.
Gabor Horvath, from the Department of Biological Physics at Hungary's Eotvos Lorand University, told AFP that the fly-repellant effect was a happy by-product of the cultural significance of body painting: the purpose of the paint is not to stop fly bites, it just happens to be good at doing so.
"We are however convinced that these people know well the horsefly-repelling characteristic of their body paintings," he told AFP.
"Essentially, the use of white-striped body paintings can be considered as an example for behavioral evolution/ecology and an adaptation to the environment." – Rappler.com