With close calls between drones and airplanes on the rise, a new study by the Federal Aviation Administration (FAA) revealed that drone collisions cause more damage to planes than collisions with similarly-sized birds.

Using computers to simulate collisions between airplanes and drones of varying weights (2.7 to 8 pounds), the researchers determined that drone components were stiffer and consequently capable of causing more damage than bird strikes.

The FAA plans to expand on the report by looking at the severity of damage of collisions between drones and helicopters and other types of planes and believes that drone manufacturers in conjunction with the FAA are responsible for developing technology that will help drones both detect and avoid airplanes.