Mangabey de Cresta Negra

activity

Activity patterns. Northern Black Crested Mangabeys are diurnal and arboreal. An activity budget recorded at La Tumba in the DR Congo was 36 - 2 % foraging and traveling, 38 - 3 % resting (especially in late morning and late afternoon), and 24 - 0 % engaging in social behavior; very little time was spent exclusively traveling (1 - 5 %). They use all levels of the forest canopy, to the tallest canopy-emergents, but lower and middle canopies (12 - 30 m above ground) are used most for foraging and traveling. They rest mostly at 24 — 42 m.

Cercopithecidae

biology_ecology

Habitat. A variety of forest types including semi-deciduous, gallery, and swamp forests. In Salonga National Park, the Northern Black Crested Mangabey occurs in swamp forests, but it does not occupy swamp in Lomako. It uses all forest levels (especially the middle canopy) and seldom descends to the ground.

Cercopithecidae

biology_ecology

Movements, Home range and Social organization. The Northern Black Crested Mangabey lives in multimale — multifemale groups of 11 - 19 individuals. The home range of a group of 19 individuals (with three adult males five adult females) at Lake Tumba (DR Congo) was 70 ha, and that of another group of the same size was 48 ha. The groups showed noterritorial defense, and home ranges overlapped by 60 - 75 %. Males disperse. A population density of 69 ind / km * has been recorded at Lake Tumba and 73 ind / km? at Lomako. Primary vocalizations of the Northern Black Crested Mangabey are very similar to those of the closely related Gray-cheeked Mangabey (L. albigena). “ Whoop-gobble ” calling recorded for the Northern Black Crested Mangabey indicate that it is a male call (as has been found for the Gray-cheeked Mangabey) and may function in intergroup location and spacing and in male dominance (males within the group and between males in different groups). About 70 % of all whoop-gobbles are heard in the morning from sunrise to ¢. 11: 00 h. Grunts are given predominantly in agonistic situations between males. Staccato barks of the Northern Black Crested Mangabey (resembling distant braying

Cercopithecidae

breeding

Breeding. Female Northern Black Crested Mangabeys exhibit a pink genital swelling when sexually receptive. In captivity, the menstrual cycle is 21 - 40 days (average 26 days).

Cercopithecidae