Fig. 4

Time synchronisation accuracies achieved on 99 bio-loggers attached to Egyptian fruit bats. Time differences were calculated using the time of arrival of proximity messages on data gateways placed inside the bat cave (B). Precise time synchronisation permitted the alignment of 800-ms-long 50 Hz acceleration bursts across multiple tags (exemplified in A; bursts are drawn with real time offsets). This capability facilitates the analysis of collective bat behaviour at an exceptionally proximate temporal resolution