Abstract
FIGURE S1 Photograph of the dorsal ridge of a Yangtze finless porpoise. TABLE S1 Marginal means and standard errors (SE) of (a) the frequency of socio-sexual interactions, and (b) the time spent engaged in socio-sexual interactions, depending on season and sex in captive Yangtze finless porpoises, East-Asian finless porpoises, and bottlenose dolphins. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
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