Movie S1.

Natural echo reflectors: First sequence: Mucuna holtonii is visited by Glossphaga comisarisii. Note that the bats first make an inspection flight to acquire the sonar information of the flower reflector and then coordinate the landing on the flower. Second sequence: Marcgravia evenia with two reflecting dish-shaped leaves above their inflorescence is visited by Phyllonycteris poeyi. Development of bioinspired sonar beacons: 3D scan, FEM-based acoustic simulation which shows the reflection pattern of a spherical concave surface and 3D printing of the reflectors, which were made with an Ultimaker 3 (Ultimaker, Geldermalsen, The Netherlands). Proof-of-principle experiments with bioinspired sonar beacons: First sequence: Steering a linear guide with sonar beacons. Second and third sequence: Robot searching for a blue reflector target hidden in clutter. Fourth sequence: Guidance of a robot with a set of bioinspired beacons connected to different commands.