The Secrets of the Salt Pans of Tunisia

Scientists in Germany found that ants can find their way around the salt pans of Tunisia by using landmarks. The farther into the desert they went, the more ant tended to build mounds at the entrances of their nests. Researchers destroyed a number of the mounds and put tall cylinders at some of the nest entrances instead. At others, they put no landmark at all. Scientists say it's remarkable the ants can do all that with such tiny brains.