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Fig. 3. Scaling of gestation periods for a sample of 429 placental mammal species (first author's dataset). Regardless of the method used, determination of a single best-fit line for the data yields a value for the scaling exponent ({alpha}) close to 0.25 (least-squares regression, 0.240; major axis, 0.255; reduced major axis, 0.285; rotation line, 0.260). (After Martin, 1989.) Gestation (days); body mass (g).





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