Sonar is essential for robots and self-driving cars as it is a very cost-effective sensor for distance measurements, but sonar also has some limitations. Sometimes sonar measurements can be misleading and there were no sonar signs or signals so far, which could assist sonar navigation. But researchers from FAU, University of Antwerp and Vrije Universiteit Amsterdam have come up with a solution, inspired by a special coevolution between bats and flowers.