Red-tailed Monkey (Cercopithecus ascinius)
Another widespread forest guenon, the red-tailed monkey is brownish in appearance with white cheek whiskers, a coppery tail and a distinctive white, heart-shaped patch on its nose, giving rise to its more descriptive alternative name of black-cheeked white-nosed monkey.
It is normally seen singly, in pairs or in small family groups, but it also associates with other monkeys and has been known to accumulate in groups of up to 200. The race found in Uganda is Cercopithecus ascanius schmidti.
Red-tailed and blue monkeys regularly interbreed in the Kibale Forest. Red-tailed monkeys occur in Kibale Forest, Bwindi, Semliki and Queen Elizabeth national parks, as well as in Budongo, Mpanga and several other forest reserves.
This species is locally common throughout its range. Densities of C. a. schmidti are 8-184 ind./km² (1.0-13.3 groups/km²; Cords and Sarmiento 2013). In Budongo Forest, Uganda, densities higher in heavily logged forest (46-60 ind./km²) compared to unlogged forest (8-19 ind./km²). These findings contrast with those of Chapman and Lambert (2000) for Kibale NP, Uganda, who report highest group densities (4.8-11.5 groups/km²) in lightly logged forest, intermediate densities in unlogged forest (3.8-5.6 groups/km²) and lowest densities in heavily logged forest (1.0-2.5 groups/km²).
The red-tailed monkey is an arboreal frugivore-insectivore that also feeds on young leaves. The primate species is found in moist lowland, submontane and montane forests, swamp, riverine and gallery forest, and forest mosaic. It occurs in secondary or regenerating forests, forest islands and plantations, and prefers forest edges. It is absent from the interior of primary forest.
Typical group size is 25–35 individuals (Cords and Sarmiento 2013).