Females stay with their natal group, males migrate. Species arranged on a family tree. Phylogeny describes how species are related. The goa of taxonomy is to classify species by their evolutionary relationships. A female has several male mates in this breeding system.
Females have greater reproductive variance than males'.
Polyandry is uncommon. No primate species is purely polyandrous. Some mating relationships in tamarins are polyandrous but most are monogamous. Mates provide extensive paternal care in polyandrous relationships. A male has several female mates.