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Regression of log-transformed mammalian body mass versus gestation period [60]. Symbols indicate the following: closed circles, terrestrial mammals; open circles, marine mammals; open triangles, other mysticete species; coloured triangles, bowhead whales (black, previous gestation estimate of 13.9 months [58]; blue, gestation estimated under hypothesis 1 (H1, this study); grey, gestation estimated under hypothesis 2 (H2, this study); red, second phase of bimodal P4 peak (this study)).
