title: Observations on the menstrual cycle of the grivet monkey. (Cercopithecus aethiops aethiops) in the Sudan.
mesh_terms: D000818:Animals; D005260:Female; D000882:Haplorhini; D008598:Menstruation / Q000502:physiology*; D010060:Ovulation / Q000502:physiology; D013397:Sudan