Figure 3:

Predicted high progesterone (yellow bars), observed baleen progesterone profiles (black dots with lines) and sightings records of two North Atlantic right whale females. (A) Female 1 (Eg #1004, ‘Stumpy’, n = 89 samples). (B) Female 2 (Eg #1014, ‘Staccato’, n = 88 samples). The x-axis depicts estimated dates of growth of each point along the baleen plate, derived from the distance from the proximal-most point on the plate (newest baleen) and the estimated baleen growth rate (from stable isotope data). Monthly sightings records are shown below for each whale, with multiple sightings within each month summarized as follows: green circle, female sighted with neonatal calf on the calving grounds; open circle, female sighted with an older (non-neonatal) calf; black circle, female sighted without a calf; and green triangle, near-term fetus discovered at post-mortem examination (Female 1 only). Note the logarithmic scale of the y-axis.