Exemplary double plotted actograms of a colony and individual foragers. Double-plotted actogram of (a) a Bombus terrestris colony (colony A) and (b) an individual worker of that colony. (c) and (d) actograms of two individual foragers of colony F to highlight the differences in foraging activity of individual workers. Each line represents two consecutive days of the experiment, each bar indicates 1 h of the day and the height of the bars indicates the level of foraging activity in that hour.
Stelzer and Chittka BMC Biology 2010 8:93 doi:10.1186/1741-7007-8-93