Figure 1: Representative feeding and locomotor activity records from a P XIE-X pigeon in DD before, during (box), and after melatonin infusions (0.93 ug/hr for 10 hrs/day). Pigeon was E-X on the day indicated by arrows. Numbers on the right side of the figure correspond to the section of the behaviors subjected to periodogram analyses (figure 2). Data are double plotted to facilitate visual inspection. Period of infusion = 24.51.