In this video the DroneFlock'18 model is used for a flocking simulation of 500 agents in a confined arena of 1400 x 1400 m, with flocking speed of 8 m/s, under realistic environmental conditions. To visualize the response, we coded the color of agents according to their individual direction of motion. As can be seen, collisions are avoided but the overall motion is not coherent enough and the density increases when the flock hits the corners.