Fig. 3From: Mixed messages: wild female bonobos show high variability in the timing of ovulation in relation to sexual swelling patternsProfiles of urinary oestrone (open circles) and pregnanediol (closed circles) in relation to changes in sexual swelling size (open bars) in two individual cycles of two female bonobos: (a) a presumably ovulatory cycle from Susi; and (b) an anovulatory swelling cycle from Zoe. The day relative to the first day of the MSP (day 0) is indicated on the x-axisBack to article page