Preliminary observations of captive female patas monkeys revealed no e
vidence of significant changes in social and agonistic behaviors eithe
r (a) broadly across the menstrual cycle or (b) specifically during th
e premenstrual/menstrual-onset phase. Despite one report of PMS-like b
ehaviors among wild baboons, at present there appears to be insufficie
nt evidence to justify extending the PMS label to nonhuman primates.