Variability of speed and altitude of an ultralight from Fine-scale changes in speed and altitude suggest protean movements in homing pigeon flights

Figure S1: Comparison of the rate of change of altitude and speed of an ultralight (A and C respectively) and a pigeon (B and D), flying at the same time, and with the same loggers. Violin plots show the distribution of the data during the flight; the upper and lower quartiles are represented by the upper and lower extremes of the box and the median by the thick black line.