Lion-tailed babies have a soft black coat which changes to the adult coat in about 2 months. The mother carries the baby on her abdomen. The group usually consists of one adult male, several females and juveniles, although some groups can have as many as 3 males. Adult females outnumber adult males by about 3 to 1. Mother-daughter bonds last a lifetime and females usually remain in the group they were born in.
Males leave just before they reach adolescence to live in bachelor groups.
Her call varies with her stage of oestrus. Before they mate, a couple groom and embrace each other. Mating occurs after the male examines the female genitals. As males in the midst of mating will often be harassed by other females, mating couples will often withdraw from the troop for a time. But the association between a mating couple is weak and doesn't seem to last long.