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. 2013 Dec 9;8(12):e81238. doi: 10.1371/journal.pone.0081238

Figure 3. Average daily ‘operational sex ratio’ (OSR) by season in humpback whales identified off west South Africa.

Figure 3

Whales were identified from tail fluke and dorsal fin pictures and microsatellites collected during boat encounters. Data shown for both those whales only seen once (n = 93) and those resighted (51 individuals in 151 sightings); calves of the year were excluded.