Black-Striped Capuchin (Sapajus libidinosus)

The Black‑Striped Capuchin (Sapajus libidinosus) belongs to the family Cebidae, subfamily Cebinae, and is one of the most distinctive capuchin species in South America. It inhabits the Cerrado savannas, dry forest patches, and gallery forests of central Brazil, extending into eastern Bolivia and northern Paraguay. Adults display a striking black stripe that runs from the crown down the back, contrasting with a lighter, often reddish‑brown facial mask and forearms. Their robust skull and strong jaws enable them to crack hard nuts and extract gum from tree bark. The species is diurnal, highly arboreal, and exhibits remarkable tool‑use abilities, such as using stones to crack palm nuts. Although currently listed as Least Concern by the IUCN, populations are fragmented by expanding agriculture and cattle ranching. Conservation actions focus on preserving continuous forest corridors and mitigating illegal capture for the pet trade.

Black‑Striped Capuchins live in multi‑male, multi‑female groups ranging from five to thirty individuals, with a clear dominance hierarchy maintained through vocalizations, facial expressions, and occasional physical displays. Groups are highly cohesive, traveling together through the canopy during the early morning foraging bout and reconvening at night in a communal sleeping site. Home ranges average 15–30 km² and overlap only minimally with neighboring groups, which are defended by loud alarm calls and scent marking using urine and glandular secretions. Communication is complex, comprising over twenty distinct call types that convey predator alerts, food discovery, and social bonding. Alloparental care is common; juveniles often receive grooming and protection from older siblings and unrelated adults, reinforcing group stability.

Sapajus libidinosus is an omnivore with a highly flexible diet that reflects seasonal resource fluctuations. Fruit constitutes roughly 30% of intake during the wet season, while seeds and nuts provide 15% and 10% respectively, offering essential fats and proteins. Insects, especially termites, beetle larvae, and ants, account for about 20% of the diet, and the species is known to use stone tools to crack hard-shelled nuts and extract palm oil. Gum and sap from bark are consumed year‑round, supplying carbohydrates when fruit is scarce. Occasionally, small vertebrates such as lizards, birds, and amphibians are taken, representing less than 5% of total intake. Capuchins forage both arboreally and terrestrially, employing systematic search patterns and memory of fruiting trees to maximize caloric gain.

Females reach sexual maturity at 4–5 years, while males mature slightly later at 5–6 years. Breeding is not strictly seasonal, though conception peaks during the rainy season when fruit abundance is highest. Gestation lasts 150–160 days, after which a single infant is born, weighing about 300–350 g. Newborns cling to the mother’s belly for the first two weeks before transitioning to dorsal riding. Maternal lactation continues for 6–8 months, but weaning may extend to 12 months as juveniles learn to forage independently. Alloparental individuals, especially older siblings, assist in infant transport and vigilance, increasing infant survival rates to approximately 70% in stable groups. Females typically give birth every 2–3 years, depending on resource availability.

The IUCN classifies the Black‑Striped Capuchin as Least Concern, yet its population is experiencing a slow decline estimated at 10–15% over the past three decades. Primary threats include habitat loss from agricultural expansion, particularly soy cultivation and cattle ranching, which fragment the Cerrado and reduce connectivity between forest patches. Illegal hunting for the pet trade and occasional bushmeat consumption further pressure local populations. Road construction increases mortality from vehicle collisions and facilitates human encroachment. Conservation measures focus on expanding protected area networks, promoting sustainable land‑use practices, and enforcing anti‑poaching regulations. Population surveys suggest there are roughly 150,000 mature individuals remaining, but ongoing monitoring is essential to detect rapid changes.

• Uses stone tools to crack palm nuts, one of the few New World monkeys observed doing so
• Possesses a distinctive black dorsal stripe that gives the species its common name
• Can extract and consume tree gum, a rare dietary trait among capuchins
• Demonstrates cultural transmission of foraging techniques across generations
• Plays a keystone role in seed dispersal for over 30 plant species in the Cerrado