Rinaldi, an ecologist working with Istituto Oikos, deployed twenty motion-activated cameras across the northern tip of the Zanzibar archipelago in early 2026. She relied on the ancestral knowledge of the forest guards to identify where the Pemba blue duiker might still move. These tiny antelopes, standing only 30 centimeters at the shoulder, are specialists of the shadows, navigating the dense floor of the island's last primary forest.
The resulting images represent the first documented sighting of the animal in more than twenty years. Beyond a single frame, the survey revealed the duiker’s presence across half of the reserve, including the Tondooni Peninsula. This particular stretch of forest is under constant pressure from surrounding villages and illegal timber harvesting, yet the duikers have found a way to persist in the margins.
The isolation of these animals is a matter of ancient geography. Unlike neighboring islands, Pemba is separated from the African mainland by deep ocean trenches that prevented the formation of land bridges during the ice ages. This evolutionary solitude suggests the paa wa pemba may be a distinct subspecies. To confirm this, scientific adviser Silvia Ceppi and the team collected fecal samples for DNA analysis, a step that would grant the population greater legal protection against a planned eco-resort nearby.
Life for the duiker is a quiet rhythm of the forest floor. They are known to follow the sounds of primates and birds in the canopy, waiting for dropped fruits to fall to the earth. To claim their small territories, they use a specialized gland near the eye to press a clear, marking fluid against twigs—a delicate gesture of ownership in a vanishing world. With the support of the European Union and the Critical Ecosystem Partnership Fund, new guards have been hired to ensure these marking posts remain undisturbed.
For conservation biologist Hanna Rosti, the find is a reminder of the resilience of small mammals in fragmented habitats. While the 19th-century clove trade saw the planting of 3 million trees and the clearing of much of the island’s indigenous cover, the Ngezi forest remains a sanctuary for the duiker, the Pemba flying fox, and the Pemba scops-owl. The survival of the antelope is a testament to the fact that even in the smallest fragments of nature, life continues to hold its ground.