In their peer-reviewed study published last month in PNAS journal, researchers tried to answer a pertinent question: when bats emerge from their caves at night, sometimes hundreds and thousands at once, how does their echolocation work? How do they not collide with each other? It is after a “cocktail party nightmare” of echo signals that must get mixed up. New Delhi: Bats are known to be blind and travel using echolocation, a technique to determine the location of different objects using sound waves. But scientists have been confused for long about how exactly this works when they’re travelling in large…