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Bivariate log–log plots of offspring body mass (a) at birth and (b) newly weaned as a function of adult mass in grams. All logs are log-base 10, all mass units are grams and the figure legend is the same for all figures. Filled grey circles, placental; dashed lines, placental OLS; filled black circles, marsupial; solid lines, marsupial OLS; open circles, monotreme.
