males separated from their male buddies didn’t grieve the separation. But females separated from other females, like cage mates and sisters they’ve lived with for a long time—any female with which they’ve shared social support—do grieve. Males put all their emotional capital in one bank, with their female partner. Females will display depression behavior if they lose their mothers, sisters, close female friends, or their bonded mates, perhaps a clue that helps explain why women suffer from depression at roughly double the rate as men.
