Fig. 3

The absolute amount of drift in seconds among Tags 1–4 over a 25 h period (A), and among tags 7–12 (B) over a 9 h period during one trial run. Each point represents an individual flapping trial, with the lines showing a linear model and the slope being the estimated drift rate. Tag 7 in B experienced a large instantaneous jump in the drift at ~ 3 h as noticed by the light blue points. All drift rate estimates for each tag, with each datapoint representing drift estimates from each trial (C). There was a large discrepancy in drift rate between the two sets of tags and thus the y axis is broken, but the original axis can be seen in the inset