1 Appendix 2 of Supporting Information 2 3 Fitness measures reported in the literature that were considered synonyms of fitness main categories used in the analyses. Fitness category examined in the analysis Adult fecundity Fitness measures reported and considered as synonyms Juveniles produced per adult; lifetime breeding success of cubs; maximum litter size (number of pups), minimum litter size (number of pups); offspring per adult group member produced; offspring per non breeder produced; probability to breed by the offspring Adult survival Adult annual mortality (%); adult survival rate; annual survival of adults; annual survival of nonbreeders; daily predation rate of adults; survival of adults over winter after 2nd or 3rd breeding season; survival of females through the next age stage; survival of yearling female offspring to second breeding season; annual survival of breeding females; adult female survival to next year; survival of breeding females; survival of females to the following year; survival of adult males; survival of adolescent males; annual survival of breeding males Female fecundity Age to first breeding; age to sexual maturity birth rates in females; births per adult female; births per year during female tenure; births per year during female tenure; breeding success (per capita offspring produced); cubs per lactating female; emergent litters with pups; female interbirth interval; fertility - whether females breed in a reproductive season; interbirth interval with surviving offspring per female; lifetime number of litters per female; lifetime per capita number of offspring reared to weaning; litter size per breeding attempt; litter size per tenure; litters per female; mean number of offspring reared per female per year; mean number offspring per female to emergence in all groups; mean number offspring per female to emergence in communal litters; number of emergent offspring per breeding female; number of female daughters produced to breeding age; number of immature per female; number of infants born/female/year that survived to at 1 year of age (RO); number of infants born per female per year (BR); number of juveniles of females; number of litters per year by the dominant female; number of offspring per female; number of offspring produced (litter size); number of yearlings of females; number offspring per adult female at weaning (litter size); number offspring per adult female weaned within 1 year; offspring weaned per female; offspring born per female per year; offspring born per sexually mature female; offspring number produced per breeding female; offspring per adult female produced; offspring per female per year; offspring per female per year produced; offspring per female surviving to year 1; offspring per litter at emergence; offspring produced by the most successful female in the group; offspring produced over 2 years; offspring produced over lifetime by females that survived from spring until the following autumn; offspring produced per female per year; offspring weaned (litter size); per capita immature produced by the females; per capita infants produced by the females; per capita litter size; per capita offspring of female reproductive year; per capita offspring of females per year; per capita offspring per year; per capita offspring produced (emergent) by the females; per capita offspring produced at emergence (12 days); per capita offspring produced by the females; per capita offspring produced that reach sexual maturity (30 days); per capita offspring produced to sexual maturity (30 days); per female number of litters; per female number of offspring; probability of breeding per 3 month period; probability of group litters to produce 1 or more offspring to emergence; probability of breeding per 3 month period; reproductive rate of females (interbirth interval); surviving births per female; time to first parturition Group fecundity Number of second generation litters; annual offspring produced by all females in the group; group productivity (total number offspring produced per group); Infants surviving to weaning; litter size (number of cubs at weaning); litter size (number of offspring emerging from natal lodge); litter size (number of pups); mean group interconception interval; mean number of foals born in harem; number of infants per group; number of juveniles per group; number of offspring per group; number offspring surviving to 0.5 years; number yearlings (1 year old offspring) produced per group; offspring produced to yearling per group; offspring surviving to year 1; overall (gross) reproductive rate; proportion of offspring (within litters) surviving to year 1; reproductive rate per year; total number of offspring produced by each group over 5 years that survived to 1 year of age (GRO); total offspring born per group; total offspring per group; total offspring produced; total offspring produced (litter size) Male fecundity Female fertility (exclude 9 males only briefly as harem holders); mean number of foals sired by harem stallion (male); number of immature per male; number of litters per male; number of young per male; offspring sired by each extra harem male; offspring sired by each intra-harem male; offspring per adult male produced; offspring per male per year; offspring produced by the most successful male in the group; offspring produced over lifetime by males that survived from spring until the following autumn; offspring produced per year of tenure in males; offspring survival to age four; per capita immature produced by the males; per capita infants produced by the males; per male number of litters; per male number of offspring Offspring survival survival of caves to 1 yr; Percent juveniles surviving through winter (5 months span); early juvenile survival per female; foal survival; infant mortality; infant mortality within 1 year of age; infants per female that survived to 1 year of age (S); juvenile survival per group; juvenile surviving per female from sprig to fall; litter survival (at emergence); mortality rate of offspring by the females; number of 2 year olds of females; number of infants born/female/year that survived to at 1 year of age (RO); number of infants born per female per year (BR); number of offspring surviving to year 1 per male; number of offspring that survived to the age of 2 years; number offspring surviving; offspring mortality per group; offspring number surviving to adult age; offspring number surviving to emergence; offspring number surviving to weaning; offspring surviving to yearling; offspring per female surviving to year 1; offspring per female surviving to year 2; offspring per litter surviving to weaning; offspring survival; offspring survival (1/mortality %); offspring survival from emergence to 1 year of age; offspring survival per group; offspring survival rate; offspring survival to age 1; offspring survival to age 3; offspring survival to age of 2 years old; offspring survival to age of 2 years old; offspring survival to year 1; offspring survival to year 2; offspring survival to year 3; offspring surviving through impendence (3 months); offspring surviving to 0.5 years (%); offspring surviving to 6 weeks; offspring surviving to independence; offspring surviving to year 1 within a 2 year period; per capita lifetime offspring surviving to breeding age (10 months); per capita offspring of females that survived to independence; per female number of offspring surviving to year 1; per female offspring surviving to adulthood; probability of litter survival per breeding attempt; probability of offspring to survive to 3 months of age; proportion of emergent pups surviving per litter; proportion of emergent pups surviving per tenure; proportion of offspring surviving to 2 months of age; survival (time) of juveniles; survival of cubs to 1 year; survival of emergent offspring of dominant female that survived to independence; survival of emergent offspring surviving to independence; survival of litters (%) to emergence from burrows; survival of offspring to 3 months after emergence; survival of offspring to year 1; yearling survival rate; yearling surviving per female 4 5 6