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Distribution of life-history characteristics for 743 nonvolant placental mammals: (a) age of weaning (duration of nursing); and (b) conception to age of weaning (gestation length plus weaning age) or total time to produce young that feed independently. Peaks recognizable in (a) take on new meaning in (b), where a trough between modes separates species that can reproduce more than once a year from those that cannot (barring concurrent pregnancy and nursing). Data from Ernest [59].
