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Tracking data (approx. 1 min) of a randomly selected representative pair, with the speed of the robofish coloured blue (low) to yellow (high), showing how it followed the position and movements of its partner by natural changes in speed (see further electronic supplementary material, figure S2). Inset shows a photo of robofish following a guppy. Data were subsetted to a region where the guppy made a number of turns and changes in speed.
