Wednesday, February 20, 2019

"a new study shows that [a zebra's stripes] discourages biting flies from landing"


Scientists have been puzzling over the role of zebra stripes for more than 150 years. But, one by one, the most commonly proposed explanations have all been refuted. Some researchers have suggested that the stripes act as camouflage—they break up zebras’ outlines or resemble fields of tree trunks. But that can’t be true: Amanda Melin of the University of Calgary recently showed that lions and hyenas can’t even make out the stripes unless they get very close. Another hypothesis says that the black stripes heat up faster than the white ones, setting up circulating air currents that cool the zebras. But