From the National Geographic, Army Ants Obey Traffic Plan to Avoid Jams, Study Says.
Posted on February 24, 2003 08:40 PM. Filed under: science.. . . ants follow a trail of smelly chemicals, laid down by other ants. Like painted stripes on a road, these chemicals tell the poorly-sighted foragers which way to go.
When raiders set out, they move along the chemical trails at high speed in one direction. However, as they encounter prey, they must return along the freeway to the nest. This task is initially very difficult with an onslaught of speeding traffic coming in the opposite direction. [continue]