Males appear to be more tolerant of each other, but will fight on occasion. Births are usually twins. Infant care is cooperative. All members of the group will carry an infant, with the adult male commonly doing the largest share. The mother only takes the babies to nurse them.
Young animals benefit from their experience with younger siblings.
Males and females with previous care-giving experience as youngsters are much more likely to successfully raise their infants from the start. Pairs without prior infant experience often lose several sets of infants before they become competent parents. Food is shared on occasion. Usually the food goes from older to younger animals. GLTs retire at dusk and sleep until after sunrise.