 What makes birds such agile flyers? One answer is their array of phyloplumes, hair-like feathers that detect tiny changes in airflow. In an effort to make flying vehicles just as nimble, researchers have created flexible microsensors that carry out the same function. These sensors can detect changes in airflow speed as small as four millimeters per second. Four curved cantilevers connected in circuit register tiny changes in voltage as they flex. Each is thinner than a human hair and about three times as wide, and can be programmed to curl to a defined curvature thanks to the cantilever's polymer on silicon structure. Adopting this natural design for sensing airflow on the fly could make autonomous flyers quicker and smarter.