It is stated that there are sufficient different morphological characteristics in order to distinguish the sexes with a certain practice, but that each of these characteristics by itself does not alone represent a completely valid criterium. These observations have shown in the periods of reproduction a chifting of six months after six years of captivity. Then the various phases of sexual behaviour are related: the male-fight, the courtship, the conquest of the partner by sexual display and finally the copulation. It is established moreover that the period between the copulation and parturition does not necessarily constitute the duration of gestation, which seems in fact shorter because of retarded fertilizations. However, there is quite a constant average of a period of gestation of 200 days. There follows a complete inventory of the 29 copulations and 67 layings that were observed.