Drones listen in on bats to reveal their in-flight secrets https://www.newscientist.com/article/2128525-drones-listen-in-on-bats-to-reveal-their-in-flight-secrets/
https://www.newscientist.com/article/2128525-drones-listen-in-on-bats-to-reveal-their-in-flight-secrets/
