SI Movie 1: The vertical speed profile of the thermal resulting from the collective movements of the entire flock. from Synchronization, coordination and collective sensing during thermalling flight of freely migrating white storks

The plot shows the vertical speed of all individuals in the flock (on the z axis) represented in relative coordinate system x, y with an origin at the estimated center of the thermal at every altitude (see also Fig. 7b). The video shows that the combination of all individuals add up to a full representation of the vertical speed distribution of the thermal. The viewing angle is rotated along the z axis. Lift is maximal in the central region and decreases with the distance to the centre