Overview
The Lesula (Cercopithecus lomamiensis) is a striking Old World monkey scientifically discovered in 2007 and formally described in 2012, representing only the second new African primate species identified in nearly three decades. Endemic to the dense, remote rainforests of the middle Lomami Basin in the Democratic Republic of the Congo, the lesula captivated researchers with its remarkably expressive, human-like facial features, soulful amber eyes, and distinctive dawn vocalizations that reverberate across the misty canopy.
Biology and Physical Characteristics
Adult lesulas possess a slender, medium-sized build characterized by a mane of pale blondish-gray hair framing an almost bare, pale grayish-pink face. A prominent vertical cream-colored stripe extends along the nasal bridge between luminous, forward-facing hazel eyes. Their dorsal pelage is grizzled yellowish-brown transitioning to striking amber on the lower back, while their underparts, limbs, and long non-prehensile tail are charcoal black. Adult males exhibit brilliant bright blue skin across the perineum and buttocks, which serves as a vivid visual badge of social maturity.
Behavior and Ecology
Unlike many arboreal guenons, Cercopithecus lomamiensis spends a substantial portion of each day foraging on the forest floor, making it semi-terrestrial. They live in small, discreet social groups consisting of an adult male, several females, and their dependent offspring. Early in the morning before sunrise, dominant males perform elaborate ‘boom’ choruses that carry across miles of dense forest to establish territorial spacing. Their diet consists heavily of fruits, seeds, and the fleshy underground stems of Marantaceae herbs, which they unearth with agile fingers.
Conservation and Human Impact
The IUCN Red List classifies the Lesula as Vulnerable due to its restricted geographic range of approximately 17,000 square kilometers, bounded naturally by major river systems. Because of its large body size and semi-terrestrial habits, the species is vulnerable to commercial bushmeat hunting with snares and shotguns. The establishment of the Lomami National Park in 2016 provided vital legal protection for the core population, supported by community-led anti-poaching patrols and biological monitoring programs.
Interesting Factoid
Before its formal scientific discovery in 2007, the first Lesula known to biologists was found living as a cherished pet tethered outside a school compound in a remote Congolese village, having been adopted by the local headmaster’s daughter.
Last updated: October 2026